actually, now that you mention it, this is not the first time i'm hearing that joel is better in the studio than he is live and that he's more of a producer than a DJ.
i was pretty zapped when i heard him the first time, i think it was moar ghosts n whatever. ghosts n stuff just floored me by the production - fat sidechained bass, pumped up drums... the filter cutoff trickery. pretty awesome. i've been trying to replicate that sound with varying amounts of success. compositionwise, i think "strobe" is his best song.
of course, let's not forget that deadmau5 is a huge gear nerd and has a very deep knowledge of kittehs, memes and teh lulz in general. this is his cat, professor meowingtons.
http://www.youtube.com/watch?v=XqdHyinGj4U (HINT: THIS VIDEO CONTAINS PURE WIN.)sometimes, when deadmau5 is bored, he posts more obscure stuff on youtube (also starring his LOLcat):
http://www.youtube.com/watch?v=Ck66ML-ByrM