What was it now? Mmmmm, 'Ripley's, Believe It or Not'. Well at our ob night tonight, Warren showed up with just the unit you are talking about.
For Canon 30D, 20D, 10D & I think he said the 350D but not the Dxxx???? not sure. But the point is, there is one avail. It is a nice looking unit too. Just plug it into your camera n set the intervals for exposures n darks etc etc etc, n walk away. The model # is TC-80N3, about 200 odd bucks.
I think the 'special plug' only fits some Canons but you can change the plug to fit yours if nec, as it's just a multiplex output thru a standard 3.5 mm stereo plug.
HTH.

L.