I believe that dumbell pullovers are a great chest and lat movement. If you do it AFTER a tough pressing workout, you will feel it in your pecs. If you do it after chins and rows then it wil finish your lats. I do it on its own workout using TWO dumbels - one in each hand and go up to 60lbs in each which causes incredible tension.
It is pretty much the only exercise that you can do that hits your lats without affecting your biceps and grip. It also pulls your chest from a totally differnt angle than any pressing movement. If you havn't already guessed, I love em!