Some guys over on the Canon 10D forum at www.dpreview.com have found a cheap source of 4Gb microdrives (much needed if you like shooting raw photos rather than jpeg). The source, Creative Nomad Muvo MP3 players...

http://www.pbase.com/image/25120048

Apparently the drive works fine in the 10D and you can replace the 4Gb drive with an old 1Gb one and still have an MP3 player

I can't find 4Gb microdrives for sale in the UK (1Gb seem to be about 120 UKP). The Muvo is 230 UKP on Amazon.co.uk, looking at the US prices the 4Gb drive will probably be 300 UKP or more.

What drive does the Nitrus use ?