Actually, I haven't seen too many DVDs yet, but this one helped me out better than any book that I've purchased (sadly, I've spent a pretty penny on them, too):
Ultimate Poker hosted by Vince Van Patten
Van Patten is a great teacher for inexperienced players, and the fact that there's also a bunch of pro tricks from the World Poker Tour is a plus. My game has improved quite a bit in the past couple of weeks.

Anyone else see this yet? It seems that Amazon is the only online place selling it, and I got my copy through my job at UMVD, the video arm distributes it apparently. Not sure who manufactures it.

Recommended though, especially for beginner/intermediate players looking for step by step pro tricks and tips.