After 5 minutes of toodling around. I think it would be for two things, a faster way to enter text or at least allow a computer to setup the TiVo apps. And I want to see my calendar and contacts on TiVo. It would be an easy way to not loose phone numbers. It’s not like your TV is walking off and you always eventually find the remote. Maybe a website like planzo where you enter the info and view it on TiVo or let other people in your group view it. Birthdays! This would make it easy to keep birthdays handy and if it were tied to a FTD for sending flowers that would be cool too. lol enough brainstorming.
An app that would download an iCal file either from a redirct in an rss file or a url could get the calendar info. Then you have to write an HME app to display it. I don’t know if contacts come is a standard file format. Birthdays are just a reocurring appointment in the calendar. You would want it to work with several online calendars since this market hasn’t stabilized.
Another useful app would be making a photo viewer that worked with the open source Gallery program. It is the one I use on this site. I’m loath to let someone else host my pictures; it’s none of their business and I don’t trust them with all the hard work it took to get them the right size. I don’t think this would be too hard, use FTP? to get file lists and display the thumbnails, Gallery does all the hardwork of organizing.