There are some interesting freelance medical writing projects listed on Elance. If you've never tried this freelance resource, you may wish to give it a try. Freelancing is a great way to "test the waters" and try something like medical writing.
Elance uses a bidding system and allows various freelancers/contract writers to bid on projects. If you're chosen for the job, then you'll have the opportunity to work out the logistical details with your client.
I'm on the Elance mailing list and I'm seeing some opportunities in these areas:
- Ghost writing for a book
- Website writing/editing for consumer health sites
- Medical blogger
- and more