You can use softcam to grab anypart of your screen to be your webcam in say msn.

So start the viewfinder in cam4you, and then start softcam to capture the part of your screen where the viewfinder is!

i have a Canon Powershot A70, and i can tell you that it actually IS capable of streaming live video, read on:
the program RemoteCapture is available for download from the Canon website (enter your camera information, follow the links, it’s easy).
run the program, and after connecting to the camera it comes up with a window named “shooting - Remote Capture” in teh foreground (with the original “Save - Remote Capture” window in the background).

on the Shooting (foreground) window there should be a large button on the right with “release” written on it, ignore this for now.
on the right is the text “Detail setting” with a triangle next to it. clicking this triangle will show you more features, so click this triangle to get them.

in these features is the “Angle adjustment” tab. Goto this tab and then click the “Viewfinder On” button (it’s below the large blank area).

the program will now STREAM LIVE video straight from the camera into the program, effectively like a video webcam. have a play with it :)

this is pretty undisputable proof that the camera is capable of operating as a video webcam. unfortuantely i have been unable to figure out howto utilise this ability in any other program - so the only use it is at the moment is within the Remote-Capture program. If only someone knew howto use or access this live videostream feature in other programs! (could it be using the TWAIN? standard)

here’s a screenshot. i’m pointing the camera at the screen so it’s making some cool parallax :). it’s displaying VIDEO - probabaly 15-20fps.

a picture displaying this streaming feature in action is also in the software manual (also downloadable from canon’s website as a PDF) on page 38, 39.

please, if anyone has any ideas or already has the answer, contact me (and others).
or Sam, perhaps we should chat.