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Also, Genghis Tron does some killer instrumentals although i'm not quite sure if that's what you're looking for. On the other side of the spectrum, ala' non-metal, check out Gov't Mule. I can attest that not only studio but live they put on shows beyond control. Also, if you're into it, anything considered 'Jam,' is pretty much all instrumentals. If you're on OiNK, check out almost any live Grateful Dead show.

Metal has gems as far as instrumentals go but there's so much more beyond the genre boundry.

i'm uploading 'whitewash,' off of the album colma by buckethead. i think it's one of my favorite instrumentals ever.... no upload, megaupload glitched. i'll send you the whole album if you want it.