Neat indeed. Great, slick design, and clearly useful. I'm about to write the same functionality into my swombat.com codebase, so I can really see the use for it. Tweeted about it: http://twitter.com/swombat/status/22747385750888449
Thanks! I agree it's actually not too difficult to write, although there are a few complications when making it a service for many (timezones was the main one).
I built it to scratch my own itch and also to put into practice all my learning of lean startup ideas, development and user experience. It was a real challenge to hold back and launch with a minimal yet complete (in the sense of being useful) feature-set. Now I'm trying to scale it up, I would love to ease off the amount of time I need to spend on contract work given time.
