I don't know how many of you guys use this, but just about 100% of my looking up of baseball stats is done at this site. Anyway, the new updates which are available with the beta page are INCREDIBLE. You can click on rows to total the stats, get an easy to post (in code tags) format for here, and the sabermetric stats included blow everything else away. If you're interested in baseball stats at all or use the site for anything you should check it out the beta. http://sandbox.baseball-reference.com/
If I could marry a website, it would be baseball-reference.com. Hmm... actually, maybe I'd marry hotasianfantasies.com. But for sports sites, definitely Baseball Reference.
*sniff* It's...it's beautiful. The hover boxes for the category abbreviations are great. Including league averages in the sortable columns: great. Cheap wins and tough loss categories! Leverage indexes! The option to hide non-qualifying players! I'd like to say a few words in memory of FanGraphs, the website I used to use for ratio stats and the such. Sorry, FanGraphs.