Want a great website for screenwriting? Check out wordplayer.com written by the enormously successful screenwriting team of Terry Rossio and Ted Elliot. What have they written you ask? Well, just movies like "Pirates of the Caribbean" one, two, and soon to be released three. Oh, they also wrote "Shrek". And "Aladdin" and "Little Monsters" and a bunch of movies.
Their website (and written before the blog craze) is chock full of tips, advice, columns, humor and direction about making it in Hollywood. Check it out. Read the columns. These guys really devote a lot of time to the columns. They tell you as it is.
I also recommend simplyscripts.com to download or read scripts online. Great resource and they often have current scripts available for free!
I'm really looking forward to seeing "Superman Returns". Great reviews and it just looks like a terrific summer movie. Finally! I saw "The Break-Up" with friends and it got a mixed reaction (the ending is different in the script). One friend loved it, two hated it, another was so-so, and I thought it was okay. I think in some way we expected a happier ending and to retitle it "The Make-Up".