As Trapz101 said, every movement that requires a pull to the body will work the whole lat interface.
Can not isolate the lower from the upper portion of this muscle group. Even Cleans and Hi-pulls affect the lats. Every lat exercise that requires a hand grip, will always call into play the biceps (regular or curl grip). Most effective total lat exercise would be movements that have the elbows leading the movement; as a pullover machine, with the elbows resting on pads. The Nautilus lat machine would be the prime example.
Lat's seem to respond very well with full stretching movements. Extra wide chins will give a whole new experience to the lats. As will extra close curl grip chins, the hands almost touching each other. Take a slight pause and dead hang of the bottom of the chin on each rep. No semi reaching the bottom, want a full stretch. You will feel the difference. Cable one arm pulldowns are another exceptional lat movement, again allowing full stretch. Cable one arm sitting row are good also. One arm work, of any kind, insures equal develop and strength, to both side of the body. Which a lot of guy's don't seem to have, talking balance here.
The pullover (either BB or DB) is an excellent lat builder. With the bent are version, anyone can work up to some impressive weight. With the straight arm version, tend to use a lighter weight. The bent arm version will allow more of a fuller stretch at the bottom of the lift. Art Jones based his nautilus machine on pullovers. Jones also called the pullover the upper body squat, for good reason. (personal view; made some of my best progres on the bentarm pullover. Also did a combo of the pullover and press. Hitting the lats, chest, delts,triceps (strong influence on the triceps) and even abs. Some have gained a couple of inches, with this combo, on the total chest size.
As we all know, Dl's build late. As do Romanian Dl, which also allow a very good stretch. As do SLDL's.
TbombZ mentions the 45 degree row, which some preform as a semi Row/DL. A excellent exercise and mass builder. I would have this as the number 1 BB rowing exercise..personal choice only. Good Luck.
