Blog
Openings
1.e4 for White
Black vs. 1.e4
Tactics
Endgames
Buckley
Links
katar chess
Interactive Online Puzzles
Some of these have endgame puzzles too.
Chess Tempo
Chess Tactics Server
Adaptive Tactics Server
IdeaChess
Non-Interactive Puzzles
puzzles in PDF format for printing
WTHarvey.com
- chess puzzles by GMs
Ward Farnsworth
- verbose descriptions of tactics patterns
Commercial ($)