I'm too lazy to take pictures of mine so I stole the pics off Newegg
The one I use with my notebook, Microsoft Comfort Optical 3000
The one I use for my desktop, Microsoft N71-00007S
I prefer the comfort Optical 3000 more because there's no clicks when you use the scroll wheel, and it has an extra button, I just use it for magnify.
I don't like wireless because I had a bad experience with a wireless mouse/keyboard. The batteries would die within one day... Either something was wrong with the stuff or I wasn't doing something right... It was a Keytronic set that I got for free. I just sold it for $10 and went wired.