I just wanted to update my Xcode installation, recently 4.2.x...
I opened the App Store and found no update for my installation.
Don't ask me why, but it seems that you need to go to here:
and select Xcode 4.4.1.
There you have the Xcode 4.4.1 installation (1,8GB) and the command line tools for Lion and Mountain Lion.
Hope this helps someone and saves some time.