Can Google improve search results?

More and more spammy websites are nowadays coming up in the search engines, and Google is struggling keeping up with all the spammers getting more and more savvy.

example:
"cheap herbal tea": loads of noise on first page results in Google. Most of the pages displayed are blogs whose comments have been spammed...

Check out Yahoo, no garbage (well, strictly speaking..)

Google is also pushing spam websites (called "adsense website"!) at the top. if you search for "SEO and CMS) for instance, the Google results are filled with garbage, all subdomain names created on the fly, and usin syndicated content. The algorythm is just not clever enough to keep them out.

One of the method used by spammers until recently was to by 100s of domains, and stick aggregated content on them. Since you could cancel a domain name within 5 days, all they had to do was to check which ones were performing the best after after 4 days, keep them, and get rid of the others. Everything could more or less be automated.

How could Google fight against this type of spammers? If Google decided to refine their terms and conditions, and make the adsense sign up a bit more difficult, ensuring that someone who spams can be banned from using an adsense account, they would definitely reduce significantly the level of spam.

But they would also reduce their revenue. So, at the end of the day, what goes round comes around. By trying to maximise their revenue, Google reduces the quality of their results.

Time to see a new player in the field, interested as Google was in providing with the best results, without compromising with a revenue model too demanding.