Ordered  a  "Das  Keyboard Model S Professional" today. I still own an
 original IBM Model M keyboard (part number 1391403) but I can't use it
 on my main machine:

   -- It doesn't have a "Super" key. I definitely need that key.

   -- My  current machine does not have a PS/2 port nor does it have an
      AT port. USB adapters for those two connectors suck.

 Although being built in 1985, the Model M still works flawlessly. Many
 children  "used" my keyboard, so I'm really honestly surprised that it
 still works.

 I ordered the version with Cherry MX Blue keys[1].  I'm curious how it
 feels compared to the Model M. Nice bonus: The keyboard has a USB hub.

 I'm  a  bit  saddened,  though,  that  I  won't be able to use the Das
 Keyboard at work. My colleagues would kill me. :-)

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 1. http://deskthority.net/wiki/Cherry_MX_Blue