Yahoo SERP is 50% SPAM

So i was searching for "bingo" in Yahoo Canada today, in preparation for our new Canadian bingo site, and I came across something rather surprising: SEO SPAM--tons of it. Of the 6 results above the fold in Yahoo, 3 were blatant examples of javascript cloaking, the same thing killing German companies online these days.

I consider myself a pretty white hat SEO these days, with some pretty good rankings to back that up. Awful SPAM like this pisses my off. Where is Yahoo's Matt Cutts? Who do I tell about this?

For posterity, here is what I found. (Click for larger images):

1. The search in ca.yahoo.com. #3, #4 and #6 are SPAM:


2. Listing #3 is a doorway page for PartyBingo, cloaked using javascript. Compare the page the spider and non-js user sees on the top with the redirect on the bottom.

becomes

3. #4 is a cloaked doorway to Mad Bingo, also using javascript.

becomes

4. #6 is a doorway to BingoHall. At least that one has the courage to say BingoHall in the doorway title.

becomes

Am I the only one who has enough of this? Especially the Party Bingo redirect, which is just gibberish stuffed with keywords. What can I do? Should I just use Yahoo's Report Spam Tool?