http://www.primate.wisc.edu/people/hamel/cp.html Ray Hamel's indispensable link list

http://www.nytimes.com/crosswords Crosswords from the New York Times. You need to pay a subscription to access most of them but there is a weekly freebie from the archives.

http://www.crosswordpuzzlegames.com Thousands of US-style crosswords along with the opportunity to create your own. A word puzzle helper also available.

http://www.btinternet.com/~ed.xword/index.html Some excellent crosswords, many with themes, and some interesting crossword articles.

http://www.chrisparadine.co.uk A collection of themed cryptic crosswords

http://www.UKPuzzle.com A collection of interactive puzzles by Anax, who appears on this site.

http://members.fortunecity.co.uk/mackem A growing collection of cryptic crosswords.

http://www.xwords.co.uk This site offers the opportunity to create your own puzzles online

http://poinscrosswords.com Crosswords by Poins, a contributor of two puzzles to to this site.

http://fifteensquared.net A daily blog giving a breakdown of Guardian and Independent puzzles. Very useful if you do these puzzles and get stuck!

http://bestforpuzzles.com  A site containing many cryptics and all sorts of other puzzles from Michael Curl, who sets for the Guardian as Orlando and the FT as Cincinnus, and also some crosswords by Araucaria..