Script Collector has been sharing scripts via Twitter but due to popular demand they've brought their blog back.
Although always check who wrote the script to avoid disappointment. "The Time Traveller's Wife (2009)" and "The Taking of Pelham 1-2-3 (2009)" are not the movie versions. Although there might be an interest in working out why those earlier drafts were rejected.
The former is by Jeremy Leven but Bruce Joel Rubin was brought in at the last moment for what appears to be a page 1 re-write as he gets sole credit. Having read the first twenty pages, it seems obvious why. It's not that Leven's writing is bad but I prefer Rubin's choices.
The latter is by David Koepp who I'm a fan of although he does get bad mouthed often. His version is more faithful to the novel and Brian Helgeland's page 1 rewrite basically updates the film.
Script Collector recently had a Hitchcock weekend where they posted 8 scripts and promises more specials. I now have a fresh crisp print-out of my favourite - North by Northwest by Ernest Lehman - to read and can barely contain my excitement. Yay! Yahoo! (Sorry, I couldn't contain it any longer)
Also worth a bookmark is Scriptshadow who posts and reviews scripts being shopped around. Although you sometimes have a limited time to download before he's ceased and desisted. Following him on Twitter lets you know as soon as scripts are posted.
His current review is of a comedy that sold for 1.75 million bucks but which isn't very good. Putting aside the jealousy that I can't sell my crap scripts for that much, the review is insightful and of a practical help when concepting and outlining our own comedies.