Hi Eric,
about a camera remote control for 350D/400D. Look at
this one. It works through walls even 20 meters away from a camera and it supports bulb mode.
I've bought it with some ideas in my mind to modify its sender to be able to connect it with serial camera control adapter. The whole idea is to build wireless control via PC software and eliminate the need of using a cable fot it.
Unfortunately during a test of this modification I realised that it's not just as simple as connecting cables running from serial adapter to a switch of RC sender and I put this project on hold for a while. However I'm pretty sure it can be done and I keep looking among my friends to find the one who has enough skills to help me this.