http://www.puzzlers.org
2. Cruciverb-L
http://www.cruciverb.com
3. American Crossword Puzzle Tournament
http://www.crosswordtournament.com
4. Puzzle Choice
http://www.puzzlechoice.com
5. Rubik's Online
http://www.rubiks.com
6. Puzzability
http://www.puzzability.com
7. The Puzzle Depot
http://www.puzzledepot.com
8. Jig Zone
http://www.jigzone.com
9. thinks.com
http://www.thinks.com
10. The QuizSite
http://www.quizsite.com