Well... that's an interesting idea, although it looks as if that software was developed more with non-SLR cameras in mind. I briefly looked at both those packages...
With an SLR you'll need a shutter actuation for each image... no live view (except for the new Canon 40D, and the soon to come Nikon d300, and maybe a few other lesser known models...).
So does that mean you've replaced your 350D? I've got the original Digital Rebel, and think I'm going to get the 40D soon...