Fresh RPMs. Handy.
You should take a look at Ximian Red-Carpet
With it you can subscribe to channels such as RedHat 9 or Fedora or Mono (the .Net for linux) and it tells you all the new libraries and keeps track of what is currently installed on your machine. It also resolves any dependencies that you might have (as long as it can find them). You can get it at www.ximian.org
Also the Ximian Desktop is quite good, it includes red-carpet, evolution (outlook type thing) and a few other apps.
Heh. Yeah, I know about Ximiam, Red-carpet, the Mono channel and Evolution.. ;)
Most of that ships with Fedora (1 and 2). I had to add the Mono channel.