Really odd. All the kismet .ipks are giving me hassle when installing.
I never did figure out why the .ipks weren't installing. I just tapped on them repeatedly from both network feeds and the Install Files folder and after a while they suddenly installed. Forget skill and know-how. What it takes is persistence.
I had to edit the .conf file in BBEdit (copy, edit, paste, delete, rename) but now Kismet is working like it should. Found my internet sharing address on my iBook.
Thanks, everyone, for figuring all this out so all I had to do was follow directions and wrestle with my own ignorance.
One remaining question, though: Does Kismet automatically join the networks it finds, or does the user have to do that manually through the Network app?