When it get my new 17'' MBP, will the built-in isight be able to work on MSN and AIM video chats. My old PB G4 attached isight didnt work on those. Thanks.
iChat connects to the AIM network, so you can do AIM chats through iChat.
MSN Messenger for Mac isn't video/audio capable. However I believe it is possible to do audio/video chats on the MSN network using third party apps (aMSN for one I think).
I tested iSight under Bootcamp with MSN and it works. The audio required a separate step. It is very unintuitive. You first get the video working and then you do a audio connect separately. Typical Microsoft.