There are several other worthwhile websites out there. Here is a list of some you may not have seen before.
Thinkers' Press Inc. -- An independent publishing company run by Bob Long.
Chessville.com --The site of a massive-circulation chess periodical
Marsh Towers -- A great blog full of reviews and other interesting posts.
Chessforums.org -- I post on this forum sometimes (mostly in the opening analysis section)
The Chess Mind -- An interesting website run by Dennis Monokroussos.
Greg's Chess Progress -- A personal chess improvement blog of a really nice guy.
The Zuke-Duke Forum -- A forum for players of the Colle System.
ChessVideos.Tv -- A great place to watch instructional videos.
TWIC -- If you play chess, you know what those letters stand for.
The Kenilworthian -- A very active, quality chess blog about New Jersey Chess and Chess in general.