I recently reinstalled all my OSes to a new hard drive, but I'll let you see what my desktop looked like before I reinstalled, running Ubuntu with XFCE4:
http://nintendud.net/images/snapshot2.pngI took this screenshot to show people the power of Linux. I'm running on a Pentium III 800 mhz with 384 megs of RAM, and all of this is running full speed. Mplayer is playing a relatively high quality XviD file full speed while amaroK has a large amount of MP3s loaded into it. Firefox is running, and Azureus is also running, seeding 62 torrents with no slowdown in sight.
http://nintendud.net/images/snapshot3.pngThis is my second screen, aka my "IRC Screen". The new XFCE4 beta has a problem with the NVidia Xorg/XFree86 driver and dual screens, so the taskbar does not appear on this screen (I reported it to their BugZilla). You can see Comcast's Speedburst (or whatever they call it) in effect here, since my normal download speeds are about 800KB/s, but now, for the first two minutes or so, it downloads above 1000KB/s. This screenshot was taken at the same time the other screenshot was.
Anyway, my Desktops may not be purty, but they are functional as heck, and get the most out of this older computer.