If you ever want a challange try installing Ubuntu 9.04 on a 500mhz PowerMac with 256 MB of ram.
I came into contact with an old PowerMac G4 at my company that we currently wern't using because of its extreme slowness... and decided to try my luck at installing Linux on a Mac. What did I have to lose?
In my research I found that Ubuntu was compatable with the ever so dreaded PPC... so i decided to tempt fate and install it on this Mac sice I really couldn't use OSX anymore.
The big problem I ran into is that Ubuntu officially stopped supporting the PPC edition around version 6 or so, so it was a community supported project. The edition can be downloaded here. http://cdimage.ubuntu.com/ports/releases/9.04/release/
So anyway I manage to get the .iso files downloaded and burned to a disk. It wasn't very hard to get the distro to install on the mac and I was supprised I didn't really have to do much. (It ran slower than dirt with the live CD in the drive, and took about 30 min to install the files to the hard disk)
After installing it to the disk and removing the live CD it booted into the ever familiar 9.04 Gnome login screen. It ran pretty decent for a 500 Mhz PPC, but I decided to dig around some of my old stuff and tracked down a few old sticks of PC-100 memory and managed to upgrade it to 640MB and the speed increased drastically. The only serious problem I encounted is that the G4 PowerMac comes with a AGP ATI Rage 128 Pro Graphics card. (I'm sure it was top of the line 10 years ago but.... ) and apparently there are some nasty graphical problems with it. I couldn't get the desktop to register anything more than 600 x 800 and it didn't recognize the graphics card driver. It doesn't run Compiz at all, but overall would make a decent e-mail / web browsing system so long as you don't install KDE4 (An epic mistake I thought the Rage would handle....
I went so far as to try and integrate it into our Windows Domain with a few handy utility's I learned about on the MintCast. It worked to a point, but i'm still trying to work out some "Couldn't Contact A Domain Controller" error when I first log in... but that's another story.
All in all if you come into contact with a PowerMac G4 and want to have some fun, putting Ubuntu 9.04 on it will blow a good 6 hours of your day, but you can walk away saying "I did that and have no clue why"