I don't currently carry one but I have entertained the idea. Currently thinking about a 3D mouse. Now that'd be worth the hassle.
Can I ask those who use mice while travelling: what mouse do you recommend?
I'm happy with any old cheap, small mouse, but the one thing I can't stand is that they all give you over a meter of cable. Argggh!!!
The mouse is going to be immediately adjacent to the laptop. Always!!!!! 0.5m would be the absolute maximum cable. (I'd rather not have to keep changing batteries either.)
I carry a small wireless travel mouse for my MBA that I keep in my bag when I am on the road
I don't always use it, but I like having it handy at times