Yes, this is a very good site, I have seen it before. Its almost one of those "wow, there is so much stuff, is this a free site?". The author of this site definitely wins the award for "He whose name most matches his occupation". Doesn't it sound like Ward Farnsworth would be a professor at the Boston University School of Law? Good for him, thanks for keeping it free!
Tactics site that is helping me
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First a disclaimer: I love chess.com and the tactics trainer, etc...
That being said I've found a site that seems to be helping my game immensely in combination with the tactics trainer:
http://www.chesstactics.org
What makes it different for me is that he does a great job of walking you through the thought processes a player should go through to identify the potential for forks, pins, skewers, etc... in a given position. It may just be me, but the information is presented in such a way that the ideas just started 'clicking' for me.
Check it out. I'd love to know what you think. (For the record, I'm in no way involved with the site, just thought it was pretty cool.)