Slitaz. It is a mini linux distribution like puppy or Damn small linux but the good news is it keeps it's kernel up to date. It loads on my desktop much faster than puppy. It doesn't have a penmount package availible but it I recall there is a driver called PenMount for Linux GPM.
The distro comes with tazwok a command line tool to configure and compile a package from source which if I recall PenMount for Linux GPM is. With the upto date kernel there is some promise. The big thing is will it load on the Webdt 366. It has xvesa. I will assume that it works and I will test it when I get my Dt back in a few weeks but if anyone is interested load it up and check it out: http://www.slitaz.org/
. I think this will be a speedy distro.