Riddler is Sash - Ecuador (Bruce Wayne Remix) and X is many songs, I have three on my comp labelled X: Vapor Trail - Crystal Method, Confusion from the Blade Soundtrack and Agnelli - El Nino (not positive if that's the right label tho on the last one)
There's a bunch of threads from last summer on this too, just do a search
--Brett, feeling strangely un-n00b-bashing tonite ...