tedster - 11:42 pm on Jun 30, 2010 (gmt 0)
I had heard some rumblings that in those situations Google might treat the link as a nofollow.
My analysis would be that your redirect script itself can still collect PR -- and that would not be the case with a literal nofollow attribute on the link. So the script could potentially rank as a URL-only listing.
All of that is purely academic, of course. It's very unlikely for the uncrawled redireect script to have relevance for any "real" search query.
But still no PR can flow to the final target page of the redirect because Google has no way to see what that URL is, so in the practical situation it is something like a nofollow. The PR "vote" still gets split among all the links on the page, etc. but the script itself can have a place, however insignificant, on the full webgraph that Google maintains.