I'm not sure if this has been brought up-- sorry for the redundant redundancy if so.
Guru.com is a networking site for freelance professionals in all kinds of fields. I'm using it for voice, writing, and media post-production. Very hit-and-miss, as all these sites tend to be. A free trial (no credit card required) lets you make limited number of bids on projects that come thru matching your skills.
While plenty are notsowonderful, this site can be unpredictable fruitful (remind you of any other services?). One of our biggest clients in awhile came from contact there.