http://www.ocremix.org
Dunno how I came across this site, but it has some awesome remixes. AW! NOW I REMEMBER (Edit) I was searching for remixes of music from Zombies Ate My Neighbors. Anyway, just wish some of the songs I really like were remixed. I've listened to Final Fantasy 6's soundtrack so many times that the remixes aren't that interesting, but some of the Phantom Train remixes are pretty good. Some of the songs are just new soundfonts or drumtracks, but most of the songs on the site are actual remixes. A few have lyrics, which I don't care for particularly (the death metal remix of the mansion theme from Castlevania II was decent, though). Some of the remixes make me drool and I can't get enough of them. I'll post the ones I've listened to that I like so far. These are mostly from SNES and Nintendo games (damn the NES had some kickin' soundtracks).
Desert Snowstorm (Secret of Mana, desert theme)
Cry From the Forest (Secret of Mana, that sad song when you get exiled)
Stomp the Summer Sky (Secret of Mana, the first upbeat overworld theme)
Dance Master (Blaster Master, fuckin sexy first stage theme)
Japanese Swamp (Blaster Master, toad's theme Danny Elfman style)
Neighburgers (Zombies Ate My Neighbors, long sexy main theme)
The Curse (Zombies Ate My Neighbors, heavy metal version of Curse Of The Tongue)
Panic of the Undead (Zombies Ate My Neighbors, second level theme)
Ghosts & Goblins Wonka Mix (Ghouls & Ghosts, the famous theme sugared with Wonka)
Advance With Caution (Bionic Commando, first stage theme war flick style)
Hillbilly Rodeo (Bubble Bobble, world-famous theme on banjo with sheep!)
Drum'n'J-Pop (Magical Drop 3, uber-sexy interlude from story mode *orgasms*)
Enigmatic Lunacy (Magical Drop 3, Moon's theme song OMG! *has multiple orgasms*)
Let me know what ones you like and i'll update as I find more I like.
UPDATE
Koan of Drums (Tales of Phantasia, elektronika mix inspired by Kajiura Yuki)
Victory Festival (Kirby Superstar, Kirby does Ireland...sounds like Chrono)