Yesterday evening also Facebook has launched an updated version of its Android client which will now features Groups and Places. As Mark Zuckerberg admitted at the press conference "the Android platform has traditionally been a little behind" because both features were already added a while ago to Facebook's iPhone client. Facebook Groups allows to share posts with small groups of friends, similar to forums or messaging boards while Facebook Places picks-up the idea of Foursquare and allows to share locations with friends, seeing where friends are and therefore allowing to discover (new) places nearby.
Furthermore, Facebook for Android 1.4.0 includes an improved notification system which now allows to view comments and updates within the application instead of opening the Web browser as well as various bug fixes.
Facebook 1.4.0 is now available from the Android Market.
Cheers ~ Arne