The recently released user.interface.x v00.01.00 dashboard is excellent
Homepage
Combines the look of the original M$ Dash with tweaked features.
Other usefull things to get:
XBMC (Xbox Media Center, plays media, codecs avaliable for most audio and video formats)
DVD2Xbox (backup discs to xbox, latest version just released)
DVDx2 (region free DVD player)
XB-FTP (for performing file transfers between 2 xboxes)
xToolBox (allows for changing of system link xbox name at will)
Usefull IRC Channels
#xbins
#xbmc
#teamuix
Usually Has lowest Mod-Chip Prices 
