Marc writes from Belgium: "I wanted to tell you about a project I am doing. It is still beta but it is functional and kind of a porta-musical breaktrough so :) I am currently developing a tracker for GP32, the open Korean console. It is inspired from a very famous gameboy tracker - lsdj - and provides an ultra portable sample based music notepad. Plans for the future include supporting other platforms (PSP,GP2x) and add midi support to transform it into a very tiny portable sequencer. The home page for the project is http://www.10pm.org/nostromo/lgpt/."
I'd never heard of the GP32, but here's a Kotaku report. You can pick them up on UK eBay for around £70-120.