Some amazing things are happening with Google Map API and now Yahoo Map API.

• Get the Most out of Google Maps
• Google Map API Documentation
• Google Mapki – forum for sharing ideas, implementations, and help for the Google Maps API.
• Yahoo Releases Map APIs
• Yahoo Maps has an application gallery
• http://del.icio.us/tag/mapping
• http://kb.ucla.edu/articles/view/geographic-information-systems

This article was originally posted on the UCLA Programmers Wiki.