See thread here.
http://geekhack.org/showthread.php?t=12038
Yep, other than being cheaper at this price, nothing.
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What I was trying to say is it may well be off topic but is also definitely cheaper than the current ebay listings here (http://cgi.ebay.com/Kinesis-KB500USB-Advantage-Contoured-Keyboard-USB-/110478187149?pt=PCA_Mice_Trackballs) and here (http://cgi.ebay.com/NEW-Kinesis-Advantage-Keyboard-QWERTY-Dvorak-/160382102062?pt=PCA_Mice_Trackballs) so a good deal for anyone in the market for one of these.