This just in from Mako Koiwai:  iPhone App remote control for Canon Digital SLRs (like the Canon 5D Mk II)

Connect your camera to a WiFi enabled computer and the DSLR Camera Remote software enables you to use your Apple iPhone or iPod touch to wirelessly adjust cameras settings, fire the shutter, review images, get a live viewfinder preview. When you combine the DSLR Camera Remote Professional Edition with a current generation Canon EOS DSLR you can access the LiveView mode, which allows you to see through the camera’s viewfinder in near real-time. This iPhone App is downloadable from onOne Software in Portland — makers of Photo plug-ins like Genuine Fractals.