I run a free newsletter called Caferati Listings, which shares writing jobs, assignments, calls for entries and submissions and the like; basically, opportunities for writers. It has just over 1600 subscribers.
After a good run, I kind of stopped sending it for five years, but restarted it earlier this year. You can see the archives at http://groups.google.com/group/Caferati-Listings
If you have opportunities for writers you'd like to share, tell me.
(Boosts much appreciated. Thank you.)