I appreciate the comments here. Any suggestions you send to me will likely get added to the next version, which I'm wrapping up now.
Regarding iChat vs iStill for still images...
I suppose if all you need is one pass images, and don't care about the quality of the image or the dimensions, you can get that from iChat. If you decide to try the software, one of the things you'll notice is that there are controls over many aspects of the video image that simply aren't available in iChat. I wish they were--it would greatly improve iChat's usability for me.
I made the registration system in such a way that if you really really don't want to pay for it, you may use the software indefinitely, you just have to put up with the registration dialog every time it starts up. Nothing more extensive is in there--no 'unregistered' message stamped on images, no timeout, no bad karma, etc.
Regarding digital cameras...
In the next version I am contemplating this as a feature. Unfortunately, very few camera companies are complying with the spec for allowing me much control over the camera itself. The ability to do much more than import images from the camera, one at a time is about all I can guarantee, though I believe I will be able to control Canon cameras with more precision.
That said, digital *video* cameras are very well supported in the next version, as are USB cameras, and hopefully a few pieces of lab equipment (microscopes).
The new feature list is extensive. Every reported bug is fixed, and every requested feature has been added. And it's a free upgrade for existing users. If anyone has further suggestions, please email them to email@example.com.