I set up @macrefurb on twitter to do the same thing a while back. Not as sophisticated, but it kinda works.

Very cool. I would like to see the implementation if you still have it.

I wired two websites together, iirc.

One was http://refurb-tracker.com/ which puts out an RSS feed of changes to the Apple Store refurbished area. I set up a feed to just watch Mac stuff (no iPods or etc).

The second part was some site that fed RSS to Twitter. Hell if I can remember where it is now.

This twitter account keeps gaining members and I can't change it anymore. It'll probably outlive my other account on twitter.

Stupid me, should have looked at the actual tweets. I used twitterfeed to push the RSS into Twitter.