Not having looked at the list, it SHOULD just be full of Led Zeppelin, Rage Against The Machine, Muse (Plug-in Baby is an INCREDIBLE riff) and Death From Above 1979. Franz Ferdinand have done some NIFTY riftys as well.
I still don't think you can call any part of Creep a riff...which bit do you mean? The chorus? Or the solo? Otherwise pretty much every modern song has a riff. Surely a riff is a series of notes that a instantly hummable/recognisable?