Get in the Freelance Directory
If you're currently on LinkedIn or considering joining it (see this report) you should also be aware of the NUJ's own dedicated listing of its freelance journalists - the NUJ Freelance Directory.
The Directory currently has 1400 members, all of whom have actually had to demonstrate that they are working journalists rather than just saying they are. Entries are free to paid-up NUJ freelance members, both full and temporary. One advantage is that it's owned not by a corporate, but by the NUJ. Go to www.freelancedirectory.org