Yahoo indexing Overture PPC Redirects

Yahoo including Overture PPC redirects in organic listings

[hotelmarketing]

One of my organic listings was indexed with an Overture PPC URL redirect (www20.overture.com/d/sr?xargs=…..). Odd. I informed my account manager who is going to pass it along to an engineer. Has any else noticed this in Yahoo’s organic listings?

[howiejs]

I have seen G do this with Adwords . . .
We use refer tracking in our URLs and I have seen this come up in the results.

[bakedjake]

Google's been indexing their (Yahoo!'s) homepage tracking URLs for a while. Ref: [webmasterworld.com...]

I asked someone about this when they launched their homepage PPC program, but never got an answer. Yahoo needs to throw up a robots.txt (at least for www.yahoo.com).