Wikis, part 2

Okay, I've received a couple of responses on Wiki resources... now I just need to find some webspace to use it and then begin building. I think I'm going to work with PmWiki, as it looks pretty easy to use.
Any suggestions for webspaces that can use it? Should I be able to use, say, GeoCities/Yahoo?
invader_haywire, I know you use GweepCo's webspace... is it easy to get set up on it to use PmWiki?
Anyone have other suggestions? I'd want to do this on the cheap... free, if possible.