Napalm: Set your desktop on fire
File this under the "totally useless but very cool for a few seconds software" section. Napalm is a small program inspired by Linux's Compiz window manager (specifically the "Fire" effects plugin) that displays burning text on your desktop.
Burning text. Words that are on fire. On your desktop. That's what Napalm does. That's all it does.
The developer seems to be keenly aware of the lack of utility of such a program (he notes as much on his website). Those looking for some clue as to why the time was spent making such a program will note his moniker: Firestarter.
It seems then that Napalm is a way to safely express his (and your) pyromaniacal tendencies.
Napalm has a wealth of customizations, so you can tweak your fiery words to your heart's content.
Napalm is a free download, and requires XP or Vista.