A website with workout vid previews and reviews
 

Just wanted to mention this website since I think it's so cool.
http://www.collagevideo.com/shape/
It has just about every work out video out there with reviews and 60 second video previews. I don't use it to buy my video's since deepdiscountdvd.com always has better prices, but the site is great if you are looking to get a new workout video and don't know what to do.