Beatfly is a small illuminated remote-control blimp that can be controlled via various interfaces such as MIDI controller, iPhone multi-touch interface, Flash interface on a web site, computer keyboard, mobile phones and voice, and music.
Beatfly is based on open source hardware and software technology, and its technical resources themselves including materials, circuit diagram, mechanical diagram, and software programs are also published as open source under the Creative Commons license.
Kits are available for $65 – but some additional supplies are needed to build it, such as helium and an Arduino.
This looks like a fun project. If you build a Beatfly, leave a comment with links to photos and videos!