Btw, you can even clearly see from their thinclients portfolio the main differences between the various units;
http://www.wyse.com/products/hardware/thinclients/
Thin Clients
Wyse ThinOS S10 ------------------------------------------------------------------------ Windows CE S30 ------------------------------------------------------------------------ Linux S50
and I belive the IDE port is what makes the difference. Small bios +IDE disk, Large bios no disk, and the S30 is just some kind of inbreed :p
Oliver