Some "Best-Of's" that i enjoy:
Underworld: "1992-2002" (of course!

)
Orbital: "Work 1989-2002"
The Chemical Brothers: "Singles 1993-2003
Tom Petty and the Heartbreakers: "Greatest Hits" (don't laugh. they rock!)
Peter Gabriel: "Hit"
Fluke: "Progressive History X"
Green Day: "International Superhits"
The Cure: "Greatest Hits"
um, i guess that's a start. i've plenty of others, but i don't like them as much!