I just took delivery of one of an EeePC (for my wife) - it's really very cool. Reminds me of the clamshell Zaurii when I first saw them.
I'll be honest and say it kills the Zaurus dead in terms of the software/hardware support. A quick play with it showed that vast amounts of standard linux apps came pre-installed as standard (kde's PIM stuff, Firefox, Thunderbird, OpenOffice, Acrobat Reader, etc) - and all configured and working. YouTube video worked first time, suspend just worked, WIFI was easy, sound + video playback - the list goes on....
It's roughly twice the size of a clamshell Z. But I have to say, it wipes the floor with it.
And this is me, long time Zaurus fanboy (SL5500, SL6000, etc) talking. I'd still keep an SL series Z for reading ebooks on the move, but beyond that, I don't see a reason to own the clamshell Zaurus anymore - the Eee is just too well done, and astonishingly cheap.