I really like using the roller on my legs - quads/hamstrings/calves/hip flexors. It can be painful at times but loosens you up really well. Ever since I "became aware" of my hip flexors I can feel them tightening up whenever I sit for long periods of time. For the painful spots, I just go slow and stay on the painful points for slightly longer. I also like to roll my lower back at different angles (while leaning slightly left or right) and my lats as well.
On another note, my latest program incorporates some nice antagonist supersets. In theory these are great because you can do a lot of work in a short period of time - all without tiring out too quickly. Say you're doing a back and chest superset. You do a set of back, rest 90 secs, do a set of chest, rest 90 secs, do a set of back, etc. So you have about 3 mins of rest between working the same exercise instead of the 'usual' minute or two that you see people using when doing straight sets. Plus, as you said, working the back allows the chest to essentially "relax" to accommodate the back contracting and vice versa, providing even more recovery.
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