Version v200906 beta will be shut down on February 2, 2010
«The v200906 API, which we released as a limited beta in June 2009 , will be shut down on February 2, 2010. The recently-launched v200909 API is a full replacement for v200906 and it adds substantial additional functionality. For most developers, the migration from v200906 to v200909 will be just …» » source | + cache
See original post by Chris Gilmer