If you want to find somewhere to send your unsolicited manuscripts, you could do worse than adding this blog Hollywood Screenplays to your favourites and/or links.
Apparently it's a re-launch of a website of the same name, only in blogform; Chris reliably informs us over on Robin's blog he remembers a few success stories and "no horror stories". Worth a try, anyway: gotta be in it to win it, no such thing as failure except not giving it a go, blah blah >INSERT CLICHE HERE<.
Let BANG2WRITE know if you approach anyone, whether they read your screenplay and what they had to say! I'll do the same, of course.