I found my searches in Wikipedia, Wikihow, and Wet Paint helpful. I learned how to properly vacuum a rug, about the national softball team, and found a wiki that summarized learning principles — I know that I will use Wikihow again for sure.

I think wikis are great for gathering information from many sources, and for finding information on topics that are too new, pop-culturish, or narrow to be found in most major encyclopedias. One has to take the information they find on Wikis with a grain of salt, though, and make sure to double check with other sources if possible.

I added a couple of links to the PRPL entry on Wikipedia. I have used wikis in the past for group projects and find them easy to edit, and great ways to share information between group members.