I've known of Web sites where freelance jobs are posted for bidding for a long time. I've even recommended looking into sites like elance.com and guru.com in my ebook.
Today I stumbled into another site that provides the same service, and that I hadn't seen before, ifreelance.com. Unlike the others, where you have to dig deep to find medical writing projects, this one seems easier to use, and more visually appealing.
Check out the page for freelance medical writers. Who knows? You may find your next project there!