IBM Keyboards were awesome. They are very interesting in that they are PC peripherals that stopped getting better some time before the PC got going, and amazingly, they can continue to be used with the latest desktop, and in principal, laptop, PCs.
There is a lot of stuff about keyboards on the web. Wikipedia is a good place to start. Clickykeyboards.com (inevitably) is another good place to look. Dansdata.com is a great read. It's so wonderful to read a guy whose feelings about keyboards are like mine. I got here because I borrowed a colleagues PC and was appalled at how bad the rubber-dome keyboard was. I replaced it with a Compaq Model RT-102 keyboard, P/N 120664-001 A. This is no match for an IBM tank, but I am pretty sure it has the buckling-key mechanism that is so satisfying to type on. As Dan says, it's so nice it just makes you want to type.
I should be working, not looking for keyboards, but they do make a difference. For a long time I resisted moving to a laptop because I knew that that the keyboard would be useless. I was right, as my fingers tell me now.
