5 great Chrome apps using Google Maps API; TripTrace; Wikihood World Browser: By organizing Wikipedia articles geographically;Breadcrumbs is a great GPS management tool; Weatherbug let’s you view your weather and get the latest local current conditions, traffic information.

Many of these Chrome Apps are utilizing the Geo APIs. 

 5 great Chrome apps using Google Maps API.

 TripTrace

TripTrace organizes all the important places that you’ve been to or think you might want to visit; perfect for local exploration or vacation planning. Photos, events, and news are merged with your personal address book, check-ins, bookmarked web pages and more.

 Wikihood

Wikihood World Browser gives users with a unique way to browse and discover knowledge. By organizing Wikipedia articles geographically, users can quickly find information about a given location on the map. Wikihood makes browsing even easier by providing a short synopsis of an article on the left side when the article’s geolocation is selected on the map.

 Breadcrumbs

Breadcrumbs is a great GPS management tool. Users can visualize, organize, edit, and share GPS data collected from any GPS enabled device (including Android devices!). Breadcrumbs is also integrated with the Google Earth API for 3D visualizations.

 Delta Embark

Whether you’re planning your next vacation, trying to find a restaurant on your next business trip, or just looking for some travel inspiration this Chrome optimized travel guide is a delight to use. Travel planning made fun and easy, brought to you by Delta Airlines!

 Weatherbug

Don’t be late to Grandma’s this holiday season! Weatherbug let’s you view your weather and get the latest local current conditions, forecast, traffic information, and more for thousands of locations around the world. 

To learn more about adding your apps to the Chrome Web Store, check out our developer documentation about apps and the store. 

Ref.

http://googlegeodevelopers.blogspot.com/2010/12/5-great-chrome-web-store-apps-maps.html