There has been innovations. Model M used a buckling spring[1] (which some people claim is unmatched) while Cherry MX uses a mechanism[2] (which some people claim is superior).
There are a wide variety of Cherry MX switches and, yes, one that has a good tactile response but is also relatively quiet: Cherry MX Clear.
[1]: http://deskthority.net/wiki/File:Origbuck1.jpg [2]: http://deskthority.net/wiki/File:Mx_clear_illustration.gif