Specs
Well, considering that no single hard drive will ever make full use of SATA 3GBps, particularly a laptop hard drive, it doesn't matter. I can definitely understand it if they were using something closer to a 10 or 15K SAS hard drive.
As far as 10/100 LAN, that is the current limitation of the switch that is used (the blade PC uses the same infrastructure as the BL e-class blades from a little while back).
Using 32-bit Vista is most likely due to software and driver issues... not to mention, I don't exactly think that you can really put in 2GB or more of memory in that thing anyway. The blade PC is meant more for places that need pseudo-dedicated computers and don't or can't go down the route of a full terminal server.
It's not meant to be an uber-powerful system, it is meant to provide enough processing power needed for most desktop uses. If you need more, there is always the blade workstation or Clearcube.