Cherry G80-5000 • The Cherry G80-5000 was the first and only ergonomic mechanical keyboard produced and designed by Cherry. Available in the 90ties, it is now a rare and expensive collector's item.
DataHand • Winner of the 2011 award, the DataHand sports perhaps the most radical ergonomic design, and people pay large amounts of money for one at auction sites and marketplaces.
ErgoDox • Winner of the 2012 award, the ErgoDox is a DIY keyboard project initiated by Dox. The keyboard is split into two halves, each having a columnar layout. It's an amazing project.
Kinesis Advantage • The Advantage is the latest incarnation of Kinesis' Contoured keyboard, first introduced in 1992. It has Cherry MX switches and a cupped, ergonomic design.
Tipro keyboard systems • The Tipro keyboard range provides a wide variety of Cherry MX based, typically non-staggered modules, for extra keys or alternative layouts.
And the Wingnut for Best ergonomic input device 2013, as voted for by the members of deskthority, goes to...