Crosswordsite - - Both American and British English styles graded from easy to hard for solving online or on paper.
Fernsmacker's PuzzlePick - - Features three different puzzles: a weekly cryptic crossword, a monthly double acrostic and a twice weekly trivia puzzle. Subscription needed.
Guardian Unlimited Crosswords - - Paid crossword subscription site with puzzles that can be solved online or printed out.
I Love Crosswords - - Hundreds of downloadable crosswords available to paid subscribers.
Know-Your-Stuff - - Free knowledge-testing word games, puzzles, and quizzes. Many specific themes to choose from. Download pdf versions or play online.
The New York Times Crosswords & Games - - The daily crossword puzzle with four ways to play, plus free classic crosswords and trivia quizzes. Subscription required.
Puzzle Choice - - Offers online and offline versions. Includes different styles such as alpha-cross, cryptic, and codeword.
The Puzzle Society - - Paid subscription site offering online and offline versions of daily, weekly and monthly puzzles.
Puzzlers Cave - - Free cryptic and themed crosswords to print or play online. Also offers a creation tool and forums.
Puzzle.TV - - Subscription-based site with new puzzles daily. Also has word search, codebreakers and cryptograms.
Sloth2Toed Puzzle Page - - A collection of puzzles from a variety of sources. Includes standard, acrostic, and daisy chain.
Tidbits Puzzles - - A collection of tidbits style crosswords.
Times Online - - Offers paid subscription to weekly and monthly puzzles from The Times and The Sunday Times.
The World's First Crossword - - Read about and solve crossword by Arthur Wynne, first published in the New York World in 1913.
XWord - Crossword Compilers - - A collection of various styles of puzzles by Anina Roux and her team, compiled for magazines and newspapers in South Africa.
Xwords.co.uk - - Play online or print and solve. Also offers creation tool. Registration is free.
Yahoo! Games: Crossword - - New puzzles daily, archived for two weeks. Free registration required.
csmonitor.com - Play on words - - Discussion about the documentary movie 'Wordplay' which shows how people from different walks of life relate to crossword puzzles. (June, 2006)