Joseph and Nikolaus let us know that GMaps was updated to V 4.01 with voice search and Buzz features. It seems google is serious about their Buzz service placing it everywhere they can. The new version also lets you sync favorite location stars with maps.google.com along with letting you use Google labs features.
The other app that has been updated to is the Google Search app if you use it regularly. Not sure what the update is there. You can pick up both updates by pointing your browser to m.google.com