From the project page over on our GMing Wiki:
“The Wiki-to-PDF project (WTP for short) is a collaborative writing project aimed at publishing free, professional-quality PDFs for the GMing community.
We’re using the GMing Wiki as a content management system — a way to handle this collaboration seamlessly and with a minimum of fuss. That leaves more time to focus on the fun stuff: sharing your tips, tricks and knowledge with fellow GMs.”
If you’re interested in collaborating with fellow GMs, and in having your work published in these two Treasure Tables PDFs, head on over to the project page for details!