Cat
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Octane, you can already do a lot of "linux" things right in OS X. What exactly is it that you wanted to learn? You can download and install Gnome and KDE through Fink and play with them, you can already use OpenSource applications that are built right into OS X, like Apache and Perl, there are innumerable OpenSource apps that can be installed through Fink (2431 packages currently in unstable), DarwinPorts etc.
What is it you want to learn about? The terminal and commandline interfaces? It's already there! The X11 environment? We've got that! OpenSource programs? There's a lot of them that run in OS X right now!
If you really really want actually run the Linux kernel on your Mac, try a live CD as was suggested. Gentoo should do fine for starters. We're still waiting for a PPC version of Knoppix. It is being worked on, but it's still in alpha AFAIK.
What is it you want to learn about? The terminal and commandline interfaces? It's already there! The X11 environment? We've got that! OpenSource programs? There's a lot of them that run in OS X right now!
If you really really want actually run the Linux kernel on your Mac, try a live CD as was suggested. Gentoo should do fine for starters. We're still waiting for a PPC version of Knoppix. It is being worked on, but it's still in alpha AFAIK.