Packagebot is project to aggregate metadata from the Portage tree and use it to create and update appropriate pages on the wiki. The source repository is at

Packagebot is written and maintained by Brant Gurganus.

For an example of what Packagebot can do, click on Category:Ebuilds.

There was an idea that came up about having wiki content drive a Portage tree so perhaps there's place for some sort of reverse Packagebot too.