tedster - 12:12 am on Dec 17, 2006 (gmt 0)

Relevance signals do seem to pass - at least I've seen a couple cases that look like a wikipedia link quickly helped with search terms that were only ambiguously present on-page and in previous backlinks. But passing PR does seem questionable to me, too. As noted above, it is hard to measure with the plethora of outbound links on many wikipedia articles.

At the same time, I'd expect a link's sticking power to be a factor on any wiki. The whole idea of a wiki involves the "community" in policing the dross. So link age would probably play into the picture, and possiby more intensely than on most sites. So I'm theorizing here that PR might pass more effectively over time, as a link gains history without being edited/deleted/replaced etc.