There are two existing threads that I think will answer your questions.
The first deals with the existing seating...
Everything You Wanted to Know on Where to Sit on the 757/767
http://www.flyertalk.com/forum/showthread.php?t=394269
And the next is the master thread on the new seating...
http://www.flyertalk.com/forum/showthread.php?t=717169
Please use either of those threads for follow-up questions.
FlyinHawaiian, Co-Moderator
United Mileage Plus Forum