If you have graphic design experience, check out the on-going logo design competition at 99designs for the Singularity Institute. There are still 6 days left to enter and be eligible to win the $295 prize if your design is selected. Tell your friends with graphic design experience too. There are very few submissions currently.
Note: This is a blind contest. Designers can only see their own entries. All designs will be revealed when the contest ends.
If you're interested at getting a peek at the designs, they will be online after the competition is over. This is standard practice in 99designs contests to prevent designers from contaminating each other and having all the designs drift in a certain direction.
The page now says $200, although I wouldn't have thought one could decrease the bounty mid-competition.
The 99designs page says it's a "bronze logo design package purchased for $295 (including 99designs fees)". However, searching that page and 99designs' site, I can't find the actual prize amount or 99designs' fee structure listed anywhere, so I assume that the $95 discrepancy is their cut. This seems rather dishonest on 99designs' part - it's quite reasonable for someone seeing that page to think that $295 was the actual amount of the prize.