Do any of you people go through a routine before you go on stage???

One thing I always do before a gig - eat well about 1.5 - 2 hours before going on. Not something heavy, though, that'll zap yer energy. I generally eat a good salad or some pasta. Something lite yet filling. Also, give yourself some time to yourself before playing, just time to relax, possibly meditate... That's about it.

I do a lot of scales and warm ups. I like to be performing in the middle of playing, not at the beginning.

Also, I make sure my hands don't get cold. No matter what.

Pretty much what Jake said. Hate those cold hands!

During the day I go through all the sets by myself to a recording of the rehearsals, especially the difficult songs. Then change all the strings and spend a bit of time going over the guitars intonation, cleaning it, stretching out the strings.
Finally, when ya get to the gig, take a pen & paper with ya to collect girls phone numbers.... might as well take advantage of your 15 minutes of fame eh...

I eat Hershey's Special Dark candy bars with the drummer write my band's name/logo on the bathroom urinal wall with a red marker everywhere we play. No better time to read than when you're visiting the privy.

Atomic

Oops. The post by Jake above was actually me. I administer this board and I was logged in as him checking some password problems he had.

I don't want to spoof my buddy Jake!

Jake probably just goes stage diving first. He is a wild man.