I second Thomas Richmond's forum.
I also nominate Branka Babic's OMNIFORM.
Here's the link to OMNIFORM: http://community.adlandpro.com/forums/27789/ShowForum.aspx
I'm going to nominate my own forum:
R.A.W. Random Adult Wordings
Poetry and sometimes unexpected prayers:
http://community.adlandpro.com/forums/33059/ShowForum.aspx