Random thoughts:
-I know I've been docked for saying this before, but a facebook app that ties in with your site might be a good way to virally grow the user base.
-My first reaction to the site's name was a play on Cthulhu: you might want to capitalize on that and make a (dyslexic?) cthulhu be the site's mascot.
-An idea for crossword generation is to take the top stories on reddit and make crosswords be based on key words (and their clues) from the stories.
Sometimes single-clicking on a square made that square get the next letter typed, sometimes it didn't. Other than that it seemed smooth.
I don't think there's a reliable route past spam filters for any kind of web-site invite. You might give users some text to cut/paste into their own email to friends.
I really should have noted that you can just cut and paste the url of you game and send that to your friends if the emails don't get through.
"Sometimes single-clicking on a square made that square get the next letter typed, sometimes it didn't"
I've never seen this myself - what browser/os?
Thanks again.
I've been working on it every evening and a couple of weekends for six weeks now, after being inspired by counttonine.com
If you want to play clutu fast, you can instantly see what your friends are doing thanks to ajax. If you prefer to play slower you can bookmark your game and/or subscribe to an rss feed for it.
clutu runs in sbcl, using hunchentoot as its web server, on an ubuntu vps. Crosswords are generated continuously and the best ones are kept in a pool so that a request for a new game is quick if the pool isn't empty.
Most fun thing so far: finding a very fast way to generate anagrams.
Least fun thing so far: trying to get invite emails past spam filters - I spent more than a week on this and it's still not reliable.
Thanks for any feedback!