A freelancer outsourcing site similar to rentacoder / elance / guru.com / etc. Includes escrow.
Guru.com is a freelancing / outsourcing service similar to elance / scritplance / rentacoder.
Elance is an outsourcing web site similar to scriptlance / get a freelancer / rentacoder / guru.com / etc.
oDesk is a little like RentaCoder but provides a fuller service including staff monitoring so projects can be paid by the hour.
Jelly is a bi-weekly working meeting where people get together to work in someone's house. It's a co-working type thing for people who can work remotely.
Post a design brief and a reward, then designers submit designs in a competition format with you choosing the winner