I have found
Poets Online to be a very useful resource of writers of poetry and sharing new poetry they consider of acceptable quality and appropriate to the prompt . I have responded to a few of the prompts posted there:
In God’s Image
Hydrocarbon Holocaust written under a pseudonym and published on the Poets Against the War Site
My Jesus
Rides Shotgun
I would encourage anyone interested in an opportunity to be part of a group of poets working on a common theme during a limited amount of time, or just looking for good a source of information take a look at Poets Online. Be a contributor, they have a new prompt every few weeks. If you don't get it published there, you still feel like people have had a chance to read it.