I also like that 4.31 - or at least the betas - is not downloaded as ISO files, but rather as separate files. This means that updating the beta is as simple as replacing one squash file (.sfs) with a new one and the distro is updated.
Pretty much the only addition I've done to the basic distro is adding pwidgets - useful little widgets sitting along the side of the screen giving me the basic info on the status of my Eee.
PupEee in a very '60 style
A somewhat calmer PupEee