Favorite Chess Blogs
1. Chessvibes : News, tournament reports and endgames studies.
2. Chess for all Ages : A little bit about everything about chess.
3. Chess Training : Not a well known blog, but worth checking out. It is not frequently updated, but when it is the content is exactly what I’m looking for in a chess improvement blog.
4. Susan Polgar Chess News and Information : Frequently updates news and puzzles from Susan Polgar.
5. The Kenilworthian : The Kenilworth Chess Club, but don’t let the name fool you, this blog contains lots of news and information not found elsewhere, definitely worth a visit.
Favorite Chess Sites
1. Chess.com: Best chess social networking site
2. Chessbase : Best chess news .
3. Chess Cafe : Best chess related articles.
4. chessgames.com : Best chess game database, also has guess the move feature which is excellent for training.
5. Chess Tempo: Best placed to practice your tactics online.
Honorable Mentions
1. www.chess.fm : Worth the visit, if only for the Dan Heisman training videos. (requires ICC membership to view most videos)
Good list, thank you for it! I would add also the blog of Alexandra Kosteniuk – http://www.chessblog.com/