ok what will trip a yahoo spam filter, well they say :

Pages that harm accuracy, diversity, or relevance of search results
Pages that seem deceptive, fraudulent, or provide a poor user experience
Pages dedicated to redirecting the user to another page
Pages in great quantity, automatically generated or of little value
Pages using methods to artificially inflate search engine ranking
The use of text that is hidden from the user
Excessively cross-linking sites to inflate a site’s apparent popularity
Pages built primarily for search engines
Misuse of competitor names/products

But they also say on their report a spammer page :

Type of Spam:

Illegal content
Redirects to another site
Porn for non-porn search
Excessive keyword repetition
Excessive Pop-up windows
Deceptive affiliate content
Machine-generated page
Deceptive title/description

So today I thought I would see if I can find a site with more than 50% of these ranking in yahoo… guess what I did .. lol and it was ranking in google too .. haha

DaveN