Yoga Journal magazine has a pretty awesome web site now and they have a store, I think that you can even download many of their yoga videos.
I'm a big fan of Veriawellness television, which is on DISH network. They air a program called Yoga for Life led by Kurt Johnsen, who I really think is a great, if under-appreciated, yoga teacher. He teaches American Power Yoga, which is Vinyasa style moves, and it's tough, but his cuing is just wonderful, and he always shows modifications. His tips and encouragement are great too. I've tried Rodney Yee DVDs and liked them a lot.
There are so many choices out there now, I know it is really hard to choose the best! I hope you find something you really enjoy! I am looking for something that is a fusion of Yoga and Pilates -- I took classes for some time doing that sort of routines and just adored it, but it was a pain having to leave home for the classes (yes, I AM spoilt!