Linux is good if you want to learn more about computing over all. Since it's open source, you get really get into and essentially do whatever you want...as long as you're willing to put in the work.

If you're new to computers are looking for Linux to replace your OS for work purposes, I'd recommend against it unless you know what you're doing. But if you have a major interest in computers, it's definately worth a shot.

I toy around with it a little. Fedora Core on one laptop and Debian on the other. My first major project was installing Debian to a laptop that didn't have a CD-ROM drive. I had to install from the other machine that had Fedora Core. It was a pain in the arse, but I learned lots. A good place to find distros is distrowatch.com. They catalog alot of different versions and updates. O'Reilly makes a real god book called Running Linux that works well as a 'tutorial' to getting around.