The Microsoft Natural Elite model 59758 was the best keyboard ever made and it saddens me that it hasn't been reproduced with modern connectivity.  Microsoft would do itself a great service by reproducing these keyboards with newer USB/RF technology build in.  The curve, the key response, the positioning... all great.  And it was their very first run of a natural keyboard.  

This keyboard is identified by it's cursor key positioning.  Rather than the "+" design of the keys, they are in an upside down "T" position.  

Microsoft Natural Elite 59758

Finding one new, in box, runs you approximately $150 USD so it's a pricey venture to nab on of these in their virgin form. 

Any companies out there willing to make reproduction models of this fantastic keyboard?  I'll gladly pick them up.