Developer Andrew R. Wallace has created a way to browse the photo-sharing site Flickr from TiVo using the new Home Media Engine feature, and it looks great. I just tried it out and my Flickr account is completely available from my TiVo. I think this has a good chance of winning Best Photo Application in the TiVo Developer Challenge.
HME apps require System 7.1, which includes TiVoToGo. If you have System 7.1, you'll need to allow HME apps to run by going to System Information and pressing clear clear 0 0 on your remote. Then, just download the Java program and run it on your computer. You can find out more at the developer's site or rate it at HME PVRblog.