I have a couple of exercise bands at my desk which I use when my hands are free. They don't take up much space, and you can get some with pretty decent resistance. You could also get a couple of ~8-10 pound exercise balls; tossing those from hand to hand can be a pretty decent light workout. Standard free weights are an option too. Honestly, you're just not going to get a lot of cardio in while at your desk. But you can do some light strength training and toning, which will help keep your metabolism up a bit if nothing else.
uservoid writes "Sun Microsystems is set to license OpenSolaris under the upcoming GNU General Public License Version 3 in addition to the existing Common Development and Distribution License, sources close to the company have told eWEEK. OpenSolaris currently is licensed only under Sun's CDDL, but company executives have previously floated the idea of a dual license with GPLv3. Sources told eWEEK that this is very likely to happen after the release of that version of the GPL, which currently is being rewritten and is expected to be made final soon. http://www.eweek.com/article2/0,1895,2084284,00.a