I am looking around for a Timer Remote, similar to the TC80N3 but for use with a Canon 400D. I tried getting one off EBAY from a company called Link-Delight, but after receiving the unit, it was found to be faulty so I returned it, and well, lets just say that it has been a rather unpleasant experience with them. (bought the unit back in late May, returned early June, and I still don't know whether it turned up.) It's a shame because it was exactly what I was after.
It looks like the TC80N3 but has the 2.5mm plug for the 400D.
So if anyone knows where to get one or even if there is a N3 to E3 adapter, that would certainly be of great help.