During Christmas, I have worked a bit on the Debian support for LEGO Mindstorm NXT. My son and I have played a bit with my NXT set, and I discovered I had to build all the tools myself because none were already in Debian Squeeze. If Debian support for LEGO is something you care about, please join me on the IRC channel #debian-lego (server irc.debian.org). There is a lot that could be done to improve the Debian support for LEGO designers. For example both CAD software and Mindstorm compilers are missing. :)
Update 2012-01-03: A project page including links to Lego related packages is now available.