limbo - 8:11 am on May 4, 2010 (gmt 0)
Welcome to WebmasterWorld :)
There are some excellent design communities out there. Many of them centre around forums or blogs.
I'd maybe contact some of the leading design blogs to see if they have a job advertising format for posts. I know some that do.
Word of mouth is going to be your other best tool. Recommendations from peers have always led me to good working relationships.