Will PageRank Last?

Is it just me or are the search engine spammers figuring out how to game PageRank and whatever other algorithms the search engines have come up with?

I did a search last night on 'pseudafed while breastfeeding' because my wife is sick and breastfeeding. On Yahoo, the top 10 results all had the name of a drug that starts with Z in the title and all of the urls ended in messages/somenumber.html. I won't name the 'Z' drug here because I wouldn't want my super popular blog to help their PageRank :))

Googles results seemed marginally better - with only 4 of the top 10 containing the same 'Z' medication. My favorite result link was one which had the same 'Z' drug in the title 3 times. The page itself displayed blank for me in Firefox, but actually contained lots of links to...you guessed it...pages referencing the 'Z' drug.

The big question is - will the search engines find a way to keep this from tainting the results or will they have to abandon PageRank schemes altogether?