dskillz1:
Go to
www.xbox-scene.com, and go to the forums.
I'd personally suggest something like Avalaunch or UIX (when it's done, it's going to be amazing), or XBMC for a dashboard.
Slayers is a good start, it installs EvolutionX, and the defult menu has a link to Avalaunch and XBMC., but it's got old versions of avalaunch and XBMC.
The new versions of XMBC are amazing. If you install xlink-kai onto a computer and keep it logged on, XBMC will allows you to control Kai from the XBMC. You'll get popups xbox-live style when in the dash, and can launch games right from the xbox, it's almost exactly like having live (besides the downloadable content).
Start with slayers, but EVOX is lacking.