We have almost got our Tivo setup how we like it.
Serving Music from Galleon - we like the colourful background, screenshows of album art and Music Organiser plus it uses Itunes library and playlists. Love the Jukebox app which allows you to make a selection of music to play as a group (more than a playlist).
Some other good apps in Galleon are podcasting and videocasting - give lists of directories and you can subscribe/download/view direct from your Tivo.
Also experimenting with PyTivo to serve Itunes videocasts and podcasts direct from PC to 'Now Playing' list on Tivo.
Still have not got YouTube plugin working properly in PyTivo - we can see a list of Top 10 Most Popular videos but none will play as ywt.
Working to set up a Flickr app that I found onliine which should allow authentication to our web-based Flickr collections direct from the Tivo DVR.