Law School Admission Council – information about the test itself, test dates, results announcement dates, accommodations, etc. They also have information about choosing a law school and the application process
Practice books (full of practice tests) can be purchased from Amazon, Barnes and Noble, Alibris, AbeBooks, and eBay. Best to buy new so you’re not influenced by someone else’s thinking/annotations. Also best to buy the official ones published by LSAC (they come in books of ten, but you can also purchase individual tests).
There are many LSAT/law school blogs out there, including Top-Law-Schools, Law School Expert, The LSAT Trainer, and Law Students (Canada), Law School Discussion, and a few are dedicated to providing explanations to questions from previous LSATs–check out Manhattan LSAT, LSAT Hacks, and the 7sage logic game videos on youtube (update — looks like they’ve been taken down) (oh well, I can walk you through them!).
The LSAT page at reddit may also be helpful, and there are several LSAT groups on Facebook.
Lastly, here are links to several articles I’ve written: