Although they appear to be slowly going off the market, the "RKS Gig Stand" looks like a nice bit of folding plastic for guitar players. The whole thing closes shut and then collapses on itself when not in use, making it easy to stash in a gig bag for travel.
If you can find them, they look like the go for $20 or so. I believe the reason they're difficult to find at the moment is that RKS Design is coming out with a "G II" model. (The same people who designed the KOR water bottle.)