In the launch of Google Maps API for Flash in May 2008 they were responding to strong demand from ActionScript developers for a way to integrate Google Maps into their applications and exploit the performance and cross-platform strengths of Flash.
However use of the Maps API for Flash remains a small percentage of overall Maps API traffic, with only a limited number of applications taking advantage of features unique to the Maps API for Flash. In addition, the performance and consistency of browser JavaScript implementations has progressed, making the JavaScript Maps API an increasingly suitable alternative.
Consequently they have decided to deprecate the Maps API for Flash in order to focus our attention on the JavaScript Maps API v3 going forward. This means that although Maps API for Flash applications will continue to function in accordance with the deprecation policy given in the Maps API Terms of Service, no new features will be developed, and only critical bugs, regressions, and security issues will be fixed. We will continue to provide support to existing Google Maps API Premier customers using the Maps API for Flash, but will wind down Developer Relations involvement in the Maps API for Flash forum.
They understand that this decision will be disappointing for Maps API for Flash developers. Google hope you will consider migrating your applications to the Maps API v3, which offers many additional benefits such as Street View, Fusion Tables integration, Places search, and full support for mobile browsers. Developer Relations team and many skilled members of the JavaScript Maps API community are available to assist you in doing so on the Google Maps JavaScript API v3 forum.
Google remains supportive of Flash as a development platform for Rich Internet Applications for Chrome, Android, and other devices. However by consolidating our development on the Maps API v3 we can focus all of our resources on delivering great new Maps API features for the benefit of as many developers as possible.