82games.com - Roland Beech's site which includes his adjusted plus/minus ratings.
Dan Rosenbaum's NBA blog - Financial and statistical information and analysis.
Basketball-reference.com - Advanced stats for indivdual players.
Knickerblogger.net - One of the best statistical analysis sites.
APBR Discussion Board (the former Yahoo! Group page is located
here) - The most prominent of all statistical analysis discussion groups.
Courtsidetimes.net - NBA and Statistics Blog
http://webuns.chez-alice.fr/home.htm - NBA Finals stats