Anyone who thinks an Android phone, you can not play games, should watch this video.
There are briefly shown 50 games in 9 minutes.

A list of all games and the publisher you can find here.

A few days ago, the new Android SDK was released. There are no signifieds user features added in version 2.1. Primarily benefit from this update Nexus One developer.
You can add the update with the SDK Manager.

All changes can be found in the Release Notes on the Android developer site.
Two new extensions in the API are the live wallpaper and the signal strength. The live wallpapers are already being used in the Nexus One.