Unicomp owns the rights to the design of IBM Model M keyboard, and makes modern version of keyboard with the classic IBM buckling spring key switch mechanism.
[see IBM Model M keyboard]
With APL Layout Keycaps
Here's a interview with Unicomp guy Mr Muyskens
〔 Old-School Keyboard Makes Comeback Of Sorts By Mr Muyskens. At http://www.npr.org/templates/story/story.php?storyId=100076874 〕
The buckling spring is a old tech. There are few other key switch mechanisms with good tactile feedback. If you want something with very crispy tactile bump feel, i recommend keyboard with Cherry MX Blue switch.
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