Quite a large number of keyboards, including some surprisingly obscure ones, have available USB converters using free software on hardware of this class. http://deskthority.net/ is probably the best place to find out more.
I found the first NeXT keyboard was very uncomfortable to use, as the keys had very little spring and you would ram home hard against the 'end stops' all the time. I suppose keyboards are pretty subjective.
They did a second ADB based version for the later model NeXTStations, which I found a lot better to use. It had an interesting 'command bar' feature too, with a long bar like a space bar at the bottom for typing command sequences.
This is great...I have a full NeXT Turbo Slab (Color!!), and I was wondering if this had been done.
The NeXT Keyboard is on-par with Model M's in my opinion.
i wish there was an easy to use NeXT emulator for my Mac — it's somewhat sad to me that i'm running Windows in VMware yet trying to emulate NeXTstep is major pain (i tried to find the OpenStep CDs on eBay too!!!).
Not quite. The unicomp/model M's were clicky. The NeXT keyboard had a nice plastic "thonk", with an echo to it, but no click. It also had a very solid (no twist/wiggle) travel.
I am considering getting one of those keyboards with the coloured Cherry key switches.