in this tutorial I'll show you how to use your Canon 1000D (the others would work, too, but I couldn't test any other) as a webcam without any hardware/software hacks, just software solutions ;-).
Sorry my English, if you find mistakes please notify me.
You'll need this stuff to use it as a webcam:
- Mini USB cable
- a PC ( I don't know how to do this on Macintosh) *EDIT* : Liveview works on OSX 10.5.2 but I don't know a program for the screen capture, yet........ ;-)
- EOS Utility (not downloadable, you should get it from the EOS Solutions Disk that is usually bundled with your camera.
-Free OpenSource alternative http://sourceforge.net/projects/eos-movrec/
Supports even AF !!!
A little video: