A few days ago, one of my Facebook peeps (sorry, can't remember which one!) posted a link to an index of TV scripts here.
The majority of the scripts are pilots. What really makes this a major score (especially for me) is that in addition to all the scripts, there are a couple of other interesting items, including show bibles (for Battlestar Galactica, Freak and Geeks and The Wire), and story guidelines for Quantum Leap.
There's also a whole lot of pilots that didn't get ordered to series (in the appropriately named Pilot_Hell folder), including Marlowe, a 2007 pilot that I've been trying to get my hands on since it wasn't ordered to series. Marlowe was to be a neo-noir update of Raymond Chandler's Philip Marlowe and I was really bummed when it didn't get picked up. Better late than never!
Seriously, I'm going to kill off hours/days/weeks reading this stuff. Already took a look at the White Collar pilot and it was interesting to see what things (including names and the location) were changed between the pilot script and pilot episode. There will probably be a lot of that.