Handheld Learning - learning with mobile and ubiquitous technologies

Anyone out there found a half decent tool for concept mapping on the eeePC?

Ive found a few but they are quite big 60-100MB and rather more than we need to do simple stuff.
Need something more than a drawing package though

Java based would be nice (I dont think I ever imagined a day would ever come when  I actually said that)
Jon

While you're waiting for the open source version of RedHalo/Activity you might like to look at Exploratree which is an online concept mapping tool that is free to use at:

http://www.exploratree.org.uk/

I recently so it being put to good effect by pupils at Radstock Primary School.

It's a development from Futurelab funded with some wonga from Microsoft as part of their Enquiring Minds project (or was that Acquiring Minds?)