Same here - we have what amounts to an open order for Optiplex GX workstations where I work. Almost 10,000 of them, last I recall.
I'm on the other end. The dealer I work for sells them. I do warranty service on them.
They're good machines, for the most part. Dell's really eaten the lunch of both HP and Compaq on the workstation side, although IBM is starting to come back a bit. Nearly every client of ours has switched from HP or Compaq workstations to Optiplex. Still, Proliants really do rule the server rooms. I love those machines, although the management capabilites have dropped off a bit since HP took over (I liked being able to get the serial numbers off of the hard drives from the diagnostic "Survey" output!)
Mark