The latest experiment: a Flash-based, logical Sudoku solver. All done in Actionscript.

As always, a work in progress. Source will be available eventually - when it gets to a good stopping point, and I'm not too embarrassed by it.

Notes:

• Update:now available as a Chumby widget. If you have a Chumby, look for it in the "Laboratory" category or add it to one of your channels.
• now almost finished. it should solve almost any puzzle you throw at it by logic and, failing that, trial and error (aka "cheating").
• also included a timer to see how long certain test puzzles take to run.
• now supports loading in two external sources of free, daily sudoku puzzles. fixed at least one glaring error in my logic.
• added a preloader so you know that it's not broken. also, it consistently finds naked doubles, triples and quads. hidden doubles are working as well, and i'm testing hidden triples and quads.
• hidden triples are working now
• slight display tweaks, as well as under-the-hood improvements and efficiencies. working toward line/box interactions - don't know why i didn't tackle them sooner.
• line/box - or locked candidates or whatever - are working now.
• more display tweaks, cells now update immediately when solved, "house" indicators turn on and off individually (though too quickly now)
• interface updates. i also fixed something i broke recently, so you can actually input a puzzle by hand again
• now available as a Dashboard Widget: click here to download it