GeorgeWGirls.com (no longer hosts the images), but as you see if you visit those sites, not any more. A web search on “WGirls” yields a bunch of sites, but most of them seem to be defunct. (Do you suppose someone wasn’t too happy about the parody, hmm?) I finally found a link (nope, that one’s dead, too), although who knows how long it will remain viable. (If that link goes dead, let me know and I’ll try to find a new one. This is the web we’re talking about; trying to kill things like this off can’t be done.)
Updated on June 29, 2010
Here’s the latest viable link. Seven years later, these images still tickle. Great Photoshopping work.