I love ALPS keyswitches (buckling-spring technology -- google it)  This is the same tech used in the old IBM "M" keyboards which you can only buy on ebay now.

My current keyboard of choice is the "Classic 101/104" from PCKeyboard.com
I have the black/grey model:  http://www.pckeyboard.com/images/ub40416LG.jpg

None of those cheap-ass membrane keyboards can even come close to the feel, action and durability of a buckling-sping keyboard.  Plus the sound is really cool I think; when I talk to people on the phone they always say "man it sounds like you're working really hard!!" -- this is due to each keypress making 2 distinct "clicks", so it sounds like I am typing 240 words per minute...hehe

However, I recently found a pretty sick looking keyboard that is supposed to also use some high-quality cherry keyswitches that are rated for like 10+ years of use.  These boards are illuminated and come in various LED colors, looks very cool:
http://www.deckkeyboards.com/index.php

 ;)

be careful,
I have been told by the original owner of Alfaclock that the www.alfasoftweb.com site is a rip-off and the Alfaclock2 they are selling is an illegal copy that is based on old beta code.  Only use www.alfaclock.com or www.betaclock.com.  BetaClock is the latest incarnation but I am currently using Alfaclock Free v1.90 and find it completely stable.