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I can recommend the FitPC2 (http://www.fit-pc2.com/). We use it since years on our KidSize humanoid robots (though non-ROS for this application) and started using it on UGVs now. There's some trouble when you want to run an hardware accelerated X server with newer versions of Ubuntu (> 9.10) due to the Poulsbo chipset, but it otherwise works fine. The case can be removed if you want to have absolutely lowest weight, but we found it to be pretty robust and worth keeping (it also doubles as a heatsink for CPU and chipset).