I was going to post this, and now C. Dale Young has, so I'll just copy his version of the post:
Summer reading period announcement:
In June, July, and August 2007, POETRY will only consider work from poets who have not previously appeared in the magazine. We encourage writers new to these pages to send work to:
444 N Michigan Ave., Ste. 1850
Chicago, IL 60611
The magazine's guidelines are here.