Thanks for the suggestions. I decided (for now anyway) to just convert the shows for watching on the Zune. So I won’t worry about 720x480, though it seems like the DVDFab team ought to add that resolution as an option.
So for now I’m converting to 320x240. I’m also using the Pan&Scan slider (not truly Pan & Scan), to crop the left/right sides so as to eliminate any black borders on the top/bottom. I’m usually a purist about that sort of thing, but the videos are for my daughter, so she won’t care, and I think filling the screen is probably better when you’re dealing with such a small screen to begin with.
I’ve run into a few issues converting with DVDFab, though. A couple of times it basically stopped converting, though the elapsed time kept ticking along. I kicked off a 2-hour movie conversion last night, and this morning it wasn’t done (elapsed time 10 hours and ticking). I don’t know if it’s a bug with DVDFab or something weird with my system. This morning I switched off Vista’s power-saving feature to disable the monitor after 20 minutes (though I would have expected that turning off the power to the monitor shouldn’t have affected any running processes). I suspect that the problem may have more to do with the fact that I’m reading the source ISO file off of my external Western Digital hard drive which is connected directly to my desktop via Firewire. I’m thinking that it’s going into some sort of power-saving mode midway through the conversion (perhaps at some point during the conversion process, DVDFab stops reading from the hard drive for a while and the hard drive goes to sleep, then DVDFab doesn’t wake it back up again?). I successfully converted the video later, and am converting another one now. But I think for my next conversions, I may copy the source ISO file temporarily over to my desktop’s hard drive.