A Powerbook G3 Wallstreet running Linux (Lubuntu PPC). The Wallstreet has had the hard drive replaced, and more RAM added (total: 192MB). I also managed to get rid of extreme screen distortion that rendered the whole screen gray by disassembling the screen and re-attaching the cables (which were somewhat loose) to the lid.
Using Linux gives me full compatibility with the machines I use for work, so I can use this Wallstreet to write texts in Vim and upload them to my GitHub account. Linux also supports wireless wifi PCMCIA cards (which I use with it occasionally).