I recall seeing a Slashdot story, which for some reason I can't find now, about keyboard usage boosting your mental focus and productivity, and mouse usage lowering it. Regardless if that's true or not, if you really train yourself, you'll get around faster with the keyboard alone!
Take away my mouse, and I'd still get by just fine! Unless surfing WWW or doing GUI / graphics design work, actually prefer to use the keyboard for everything else. And I find myself doing more and more visual design tasks through scripting rather than
RAD tools. Even in Windows, I use keyboard-friendly apps like jedit and mplayer. In the ancient browser days you could select links in hypertext by number or hot-key, and there's a
Firefox Add-On that does the same thing, but that's an overkill, especially given today's interface-heavy sites.
My laptop also flips around and converts into a tablet, where I can click and write on screen (via handwriting recognition) with a special pen, but I only use it on the rare occasions when I don't have a comfortable desk in front of me, like in a waiting room.
EDIT: error, never type USE in upper-case on a forum that might be read by sysadmins on drugs... it gave me wicked Gentoo flashbacks...