ECE497 How to install Ubuntu on the Beagleboard
I've installed 2 different versions of Ubuntu on my SD cards.
The first link references a Ubuntu wiki which details how to install a netbook edition of Ubuntu on ARM/OMAP processor-based systems. It is not beagle-specific. This image runs a little slowly, but not much slower than the SPEd image.
The second link references instructions for installing another image. This image is very minimal, and doesn't have a gui. There are instructions for installing a gui, which I did, with good success.