If you're a Linux user or you're looking for a good excuse to come over to the darkside, Google CL Tools seems pretty good. Looks like they're supporting quite a few google services already.

Actually, it appears to be just a python script, which probably means somebody could either run it on windows or port it to windows without much hassle. I don't know about anybody else, but my productivity bend has lead me to become quite the fan of being mouse free where ever possible. It's really easy to do in various flavors of linux because it has sweet stuff like Yakuake and Krunner. The latter is a pack in with just about every KDE desktop.

You can do a lot of the same stuff in Windows too.

Launchy is a keystroke launcher which - if you're not using - you're the terrorists and you should go put yourself in Gitmo. It's simply that awesome. If you want to get really cute, you can mash up console and ahk to get the Yakuake "quake style" effect.

Want to be mouse free on the web? Try Ubiquity for Firefox.