Great concept and nice looking implementation, Henry! I'd not remembered to check it out since you mentioned it in the pub the other (last?) week, but I'll definitely kick the tyres over the weekend :-)
£10 says it goes down in the next 6 hours.
I'm bored this w/e, so do get in touch and let me know if I can lend a hand with some back-end systems tuning ... email, or via the phone number on m'webshite (also on devwiki, under "contact numbers" IIRC)