It's pretty amazing how quickly some things can get spotted/fixed in the open software world. I'm out of the country for a day, and I get the following in my inbox:

Notice the date/times. A major bug in the fifteen puzzles applet was spotted by Dario, and later fixed by Jonas - all in less than 24 hours! Imagine that happening in the proprietary software world.

Hooray for open source, and hooray for contributors! :D