Here is a clip of Cyril Despres testing the bike he will use to contest the 2011 Dakar race on. This is some great footage. As expected it does not show enough of the bike to see what KTM has done to the XCW based motor to make it Dakar ready, but if you watch close there are a couple of clues.
KTM 450 Dakar Rally Bike Video
If your interests are towards something a little less high tech, you can check out Ignacio Chivite and his Bultaco 370 Frontera that he intends to race at Dakar this year; 370 Bultaco Video