Best online crosswords?

I do the NYT puzzle on the Seattle Times website, the Universal Crossword on The Globe & Mail, and the iWin crossword puzzle. All a slightly different interface. The NYT I do in competition with myself (12 minutes is my best Sunday so far), the iWin I’m competing with other registered users for score.

Universal Crossword - Globe and Mail
iWin Daily Crossword
NYT at Seattle Times

Globe and Mail seems to be down today for some reason.

Thanks for all of the comments and links.

Do note that the NYTimes puzzle in the Seattle Times lags by 5 weeks (today’s puzzle is the NYT puzzle from June 17.) You probably know this, but just in case others don’t, the NY Times puzzle in various papers is usually a week to a few weeks old, which may or may not matter to you.