Poddy Home is a multimedia application that can replace your CD player, DVD player, video recorder, all your CDs and DVDs, and your collection of videos by storing them on your computer. It gives you easy, fast, and intuitive access to your media collection without the need to search for the disc itself. The included personal VCR can be programmed not only locally but also via a Web interface from anywhere.
PianoBooster is a program that teaches you how to play the piano as well as the basics of reading musical notation. PianoBooster can play any MIDI files, listens and reacts to what you are playing on a MIDI keyboard. It makes sight reading music fun. It can make use of the "light keyboard" or "guide lamp" feature found in some keyboards, such as Yamaha EZ-200, Casio LK 220, LK-300 TV, and LK-43. Keyboards with this feature can cause specific keys to glow. PianoBooster can use this feature to show beginners which keys to press at any given time, even if they can't read musical notation.
Theory is a Python/Pylons-based Web client for the MPD system that uses Ajax where it makes sense. It includes drag/drop playlist reordering, Amazon cover art retrieval, a full-screen "party" mode, lyrics fetching from lyricswiki.org, automatic linking to the artist's Wikipedia page, and a decent theme.