Pidgin has introduced a major update with version 2.6.0, and the current bug-fixing 2.6.1, and along with more than 100 fixes between the two comes support for Google Voice and Google Talk. If you're on Windows, though, this won't mean much--the protocol currently only works with XMPP at the moment, not the derivative protocol that Google uses. Pidgin Portable 2.6.1 is also available for USB keys.
Other changes include splitting the Yahoo protocols into two, one for Yahoo Japan, and one for the rest of the world. Both protocols in Pidgin now support SMS numbers. MSN account users now can receive voice clips and handwritten notes, and there was a major security fix for MSN pushed in version 2.5.9.
The full list of changes can be read here.