Among Other Items, my humble blog, has been undergoing a bit of a change behind the scenes. Formerly, this site was powered by an old desktop computer, probably released in 2002, which had been converted into a Debian server. Now, this site is powered by a Raspberry Pi, a $35 computer which is running a variant of Debian. I can tell that the site is a little slower, but its worth it for the ability to experiment with this new little machine and because of the power savings it will reap.
If you want to learn Linux, I highly recommend getting a Raspberry Pi. Lifehacker has a lot of different recommendations for projects that you can try, and I will probably have some too if you are interested!