The Maltron keyboard, made by a company in UK http://www.maltron.com/.
Here's the Maltron in action.
The Maltron is similar to Kinesis Contoured Keyboard (Maltron designed it first. According to online sites, Kinesis copied the design). However, Maltron's more expensive and ugly. Each Maltron is individually ordered and crafted, not mass produced, and priced about USD$600, as of .
The Maltron comes with QWERTY or Dvorak keyboard layouts, but also available is its own Maltron keyboard layout.
Note that the Maltron layout may in fact be better than Dvorak, simply because it placed E on the thumb. See:
One problem that Maltron never appealed to me is because of its ugliness. Here's a Google employee reviewing Maltron vs Kinesis.
Following is another Maltron review, by a professional typer (the stenography typer in the video above). This means, if you are a programer, even if you work 60 hours weeks, the actual typing done by this guy is probably 10 times yours. (i myself was once a data-entry clerk) His article is a very good one.