Over in the 737-900ER thread there is a ton of discussion about the reconfiguration of the 757-200's, especially the reduction in first class seats.
That thread is here:
http://www.flyertalk.com/forum/delta...-interior.html
This thread is about the 757-200 only.
The 757-300 is covered in this thread:
http://www.flyertalk.com/forum/delta...ng-thread.html