Is it possible to glue or patch tire sidewalls? This morning I discovered that my commuter folding bike had a bad flat tire, and I ran out to buy a new tube, no problem.  I didn't notice until after I'd changed the tube that the tire sidewall was beginning to crack.

I need this bike for my commute tomorrow, and am not going to be able to get a replacement tire on short notice.  Is there anything I could do to reinforce the sidewall to minimize the chance of a catastrophic flat tomorrow?

I saw something on Answers.com about supergluing tears in tires, but I don't know if that's good advice or not.
You need to "boot" the inside of the tire with a dollar bill or purpose-made tire boot or some such.  You shouldn't glue the boot in place, but you may use a small dab of glue to keep it from shifting while you install the tube and inflate the tire.