Not sure how many of you check out that website, but I recently joined and got a good deal on a premium membership for life. The videos are some of the most detailed and thoroughly explained stuff I have seen on the web, and I highly recommend checking them out if you get the chance.
If you're looking for reviews, previous threads here, here and here. I've been a free member for a while, and pretty much the only reason I haven't signed up for all the good stuff yet is in a vague attempt to try and cut down on the amount of time I spend on the net. From all accounts, seems to be well worth the money: even the free section is pretty helpful.
Grapplers Guide is awesome! Great resource, great articles and about ten million black belts on there who are willing to offer sound advice. Like Luther said, no trolls, no bullshit.
The site has really helped my game. I think for the lower belts it has a ton of really detailed instructionals on it that can help one's game in that you got a source of details on stuff you have been taught in your gym and expose to stuff you haven't been taught yet so that you have a leg up.