I purchased iCam and the push notifications plug-in, and they both work great. You can thank TUAW for premiering your app on the site.
I would like to suggest a few features, which I feel are very viable to implement. I currently have 4 machines that are running iCamSource.
1. I read that people previously requested delaying push-on-motion until they have at least left the room. I agree with that feature request on the desktop app, but for people with multiple sources like myself, I would like to see the implementation done on the iPhone app level to all the sources simultaneously. Clicking on a button will toggle all sources on and off for push-on-motion.
2. Since I have four sources, it's impossible to tell which is which when all the lights are out. This is especially difficult when everytime you launch the app, the sources are not loaded in any particular order. Can you add a caption or label in both the single and multiple view modes?
Again, excellent product and I hope you keep up the great work!