GeoPhoenix, Interesting company offering zoomable interfaces for small-scale products like PDAs. It seems very similar to some stuff I worked on at my company about 5 years ago. We had many of the same ideas but the portable products weren't able to handle the all the necessary processing yet. I was also sent this link today for a company called TerraDigital. If you click on the TerraTouch demo you'll see that they are also creating a zoomable interface for their home jukebox software. The originator of all of this was, Professor Ben Bederson (along with a few other software engineers). Ben is now at the Universoty of Maryland. Here is a link to his section on Zoomable User Interfaces (ZUI's