I don't know much about sites for writers, but I do know this - make sure to get a copyright on your work before posting it. (http://www.writing-world.com/rights/copyright.shtml)and try not to publish online things you really want to get published as publishers shy away from those. Post things that might get people excited for your other bodies of work :D

I might want to participate depending how busy I am at the time... Hum... I might be changing jobs soon, so i'll have more time. I'll let you know tomorrow...