Not sure about the others but I know Canons will probably need a driver. Thankfully the details are online so someone could knock up a driver if they feel the need.
I have a 10D, not quite the one 1D / 1Ds you're talking about but given the price for the 1D (around €7,000) I don't think there'll be many users to worry about...
The 10D needs drivers for windows, the Mac seems to have them built in.
