I like these two for research and learning:
https://www.carbuyingtips.com/lease.htm
http://www.realcartips.com/leasing/
In terms of negotiating, i tried the car buying method described here (applies to leases too) and it really works if you are in an area with multiple competing dealerships. I didn't make the initital phone call as they recommend, I just did everything via email.
http://www.realcartips.com/guide/newcars.shtml