Different mouse models has been already discussed.

But all these mouse got configurable buttons. Has a programmer, how do you set them?

I use The Microsoft Intellimouse Optical. So set the Left side button to "Copy" and the Right side button to "Paste". I did not set the Wheel click to anything.

I'm curious to see if there is any better setup?

UPDATE : I'm trying to find some interesting key I could map to my mouse buttons. Copy & paste are the best I' found so far, but i just want to know if there is something that could be more useful when programming.