web2.0 services, How to post mathematics?: all-in-one for Mathematica and Matlab, subdomains Wolfram.com Mathworks.com

http://www.mathworks.com/

http://www.mathworks.fr/

An analysis of mathworks.com subdomains with alexa @june 2011:

 http://blogs.mathworks.com

In this blog, you also can search in many "sub-directories":

The other subdomains are just internals.

Web Deployment of MATLAB is not good (i.e. no widgets):
http://www.mathworks.com/support/tech-notes/1600/1608.html
http://www.mathworks.com/matlabcentral/fileexchange/12689
http://www.mathworks.com/matlabcentral/fileexchange/29642-get-html-table-data-into-matlab-via-urlread-and-without-builtin-browser
MATLAB allows interfacing with programs written in other languages, including C, C++ and Java (and Fortran). MATLAB can be connected to Mathematica and vice-versa.

The web service"file Exchange" is correct:
http://www.mathworks.com/matlabcentral/fileexchange/
File Exchange is a place in the MATLAB Central community where users can find and share content related to MATLAB development. Find example code samples (.m), tutorials or videos to help you with your development tasks. You can:

• Find files related to your programming interest
• Comment on and rate files
• Tag files
• Build your reputation by contributing your own submissions

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Mathematica
http://www.wolfram.com/

An analysis of mathematica.com subdomains with alexa @june 2011:

Mathematica has many very good web services.

The best is : mathworld.wolfram.com

 MathWorld is considered not only the clearest and most readable online resource for mathematics, but also one of the most reliable.

wolfram.com

 demonstrations.wolfram.com
7000demonstrations @ june 2011.
You need the free CDF player to use these demonstrations.

Once you install CDF Player, you'll be able to...

• Interact with applications from the Wolfram Demonstrations Project
• Explore interactive documents in your web browser
• View Mathematica examples, reports, and files.

Computable Document Format (CDF): http://www.wolfram.com/cdf-player/
http://reference.wolfram.com/mathematica/howto/CreateAComputableDocumentFormatFile.html
 As a built-in feature of Mathematica 8, it's easy to save .cdf files straight from your working notebooks, custom-formatted papers and articles, or dedicated application development workflows. Anything you compute in Mathematica can be made into a user-interactive object offering maximum clarity in the presentation of your concepts, and there are no special considerations when creating documents just for viewing in Wolfram CDF Player; all notebook features can be displayed and printed.
Three platforms: windows, linux and mac.
For mac, you have to dowload CDFPlayer_8.0.1_OSX.dmg  = 165MB (version 8.0.1 @March 2011).
The install needs 600MB on your hard-disk!
It also contains the browser plug-in (firefox).

Rem. you do not need the CDF Player if you have Mathematica installed.  In fact, the
browser plugin will always prefer to execute content in Mathematica instead of
CDF Player if both are installed. CDF Player does have a separate user interface.  Installing it alongside Mathematica would allow you to use both, but the browser plugin would only use Mathematica. You can select which installation the browser plugin chooses, but the default behavior is to always go for the one that will give you more functionality.  CDF player can open a .nb file.  But if that .nb file contains Dynamic content, then it will not play that content.  Whereas it will play Dynamic content in CDF files, with certain limitations.

If you already have CDF Player/mathematica installed on Windows or Mac, test the browser plug-in.
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integrals.wolfram.com
is an example of webMathematica:

http://www.wolfram.com/products/webmathematica/
webMathematica 3 adds dynamic content to a website. Websites with interactive controls compute new results when parameters change. Graphics, including 3D images, can be rotated in the browser. It's all powered by Mathematica's computation and visualization capabilities and webMathematica's robust, automatic server deployment that scales for high traffic and works seamlessly with modern web standards and services. webMathematica 3 adds dynamic content to your website. Websites with sliders and other interactive controls compute new results when parameters change. Graphics, including 3D images, can be rotated in the browser. It's all powered by Mathematica's computation and visualization capabilities and webMathematica's robust, automatic server deployment that scales for high traffic and works seamlessly with modern web standards and services.
http://www.wolfram.com/products/webmathematica/technology/
http://www.wolfram.com/products/webmathematica/examples/

rt.wolfram.com

reference.wolfram.com
Learn how to use Mathematica with the definitive guide: 10,000 pages with
Mathematica functions and tutorials and more than 100,000 Mathematica examples:

 scienceworld.wolfram.com
Eric Weisstein's World of Science contains budding encyclopedias of astronomy, scientific biography, chemistry, and physics. It's a complement of mathworld:

blog.wolfram.com

 user.wolfram.com

Get access to the Wolfram User Portal

• View your registered products
• Download your products and upgrades
• Access your Premier Service benefits
• Manage your profile

Use the Wolfram ID. A Wolfram ID is an account that allows you to securely access various Wolfram websites and services.

library.wolfram.com
The Wolfram Library Archive is a collection of Mathematica-related materials that have been categorized for easy browsing and searching.

functions.wolfram.com

The Wolfram Functions Site was created as a resource for the educational, mathematical, and scientific communities. It contains the world's most encyclopedic collection of information about mathematical functions. The site also details the interrelationships between the special functions of mathematical physics and the elementary functions of mathematical analysis as well as the interrelationships between the functions in each group.

There are several unique aspects to the presentation of information on this site. The material is organized in a uniform way, thereby providing a summary of the current state of knowledge in the field of special functions.

• All formulas are available not only in Mathematica StandardForm but also in MathML and ASCII form. 
• Formulas in StandardForm enable their quick and easy usage from within Mathematica. 
• MathML enables typeset mathematics to be displayed in web browsers and other programs that support it. 
• ASCII form allows the information to be copied and manipulated in other programs that do not offer support for MathML.

tones.wolfram.com
this site uses webMathematica to discover unique musical patterns in the computational universe. With webMathematica as its backbone, WolframTones dynamically generates up to a month's worth of continuous music every minute, serving each composition from back-end to user in just three-hundredths of a second.

zmail.wolfram.com
zmail is a component of Zimbra Collaboration Suite (ZCS), a groupware product. VMware Zimbra is the leader in open source, next-generation email and collaboration software. Zimbra is simplifying information technology and setting the standard for web and cloud based collaboration with innovative user experiences, such as a rich AJAX web interface. The ZCS Web Client is a full-featured collaboration suite that supports email, group calendars and document sharing using an Ajax web interface that enables tool tips, drag-and-drop items, and right-click menus in the user interface.
http://www.zimbra.com/products/compare_products.html