If you’ve been using PCs for a while, you’re bound to have an old one you don’t use much, if at all. With 2-GHz computers available for well under $1,000, what good is an old 300-MHz Pentium II system? The answer depends on your willingness to experiment, have fun, learn, and prevent pollution. Here are ten things you can do with that old PC, starting with tasks for relatively “better” old PCs, and working our way down to the real junkers. [via] Link.