This subject was in a thread a while back and I wanted to start this list for all of who can't have or don't want a 5.1 or better system and watch in 2.0. Whenver I come across a particular clear and intelligible 2 channel mix or down mix I will add it. Here is the first I just watched it.

Family Guy: It's a Trap DVD
Simply stellar. Every dialog track should be this good.

Bridesmaids: Blu Ray
Effortless and easy dialog. Really enjoyable. Never had to rewind to figure out what someone said.

M3 and
M80