Power Puff Girls / Dexter's Lab / Invader Zim / Amazing Fan Doujinshi
A while back I followed a link
from Megatokyo to this incredible
fan-produced manga (also known as doujinshi).
It's a clever mash-up of PowerPuff Girls, Dexter's Lab, Invader Zim, Samurai Jack, and many others. I don't know if I've ever seen fan work this professionally produced or drawn, and the story is actually quite engrossing.
I didn't post it at first because it just seemed like a novelty, but I've found myself going back to the site to check on the story a few times now and I figured it merited mentioning.
Cartoon network should hire this guy.
Bleedman's "PowerPuff Girls Doujinshi"