My screenplays are now on this site for you to peruse (and if you're a producer, to option!). You can see just a few of these screenplays using the link at the top of the page, or you can get there from here.
Note that for now, I'm focused on low budget scripts as a way to get produced, and that has worked in several cases (and maybe something you should consider as well, if you're a beginning screenwriter, or maybe even a seasoned one). Why is this? Well, first of all, writing spec scripts, is just that, speculative. VERY speculative. To get through the front gates of the big production companies, you need to have been produced before (and consequently represented), or have an insanely great script.
Yet having an insanely great script still doesn't guarantee anything. You have to still get someone to read it, and that requires getting noticed. Query letters almost NEVER work. If you're the less than 1% who got yours through the door, congrats. The other 99% applaud and cry in their beers in between typing out another five pages of Act Two.
That's why I'm a big proponent of Simply Scripts, which I find to be one of the best ways to get discovered as a writer. I placed several scripts on that site and have been optioned four times. There are a lot of other writers from that site as well who have similar success stories. Do yourself a favor, if you're a screenwriter, hit that site up. And if you're a writer who frequents Simply Scripts and want to chime in on your success there, feel free to leave a comment below. This is an encouraging, peer-review site that can provide you with a ton of reviews and resources to help you get better as a writer.
One thing I will add about the Simply Scripts site is that it's not a one-way street. You don't just put your scripts on the board and then you wait for the reviews to start rolling in. It's a quid pro quo system, where the more you review and get known by the other writers on the board, you'll get more reviews in return. Give it a shot!
Good luck!