I use the Panasonic GH1, G2 (Micro Four Thirds dSLRs) and Sony HVR-A1 (HDV camcorder).
The small size and light weight of the Panasonics is really helpful, and I like the built-in EVF and the usable autofocus for the occasions when I want it, something that’s not workable with Canon dSLRs.
I also like being able to use classic wide-aperture manual focus lenses such as Olympus Zuikos on the Pannys (with an adapter).