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There's a lot of junk exposure out there, never seen by a human eye, where the clicks are generated by robots. There are so many scams you could write a thick book about them all... Anybody offering you a 'guaranteed' search engine ranking should especially set off your alarms.
(oopps. ..I just re-read your post. Looks like you're on the AdSense side of things, not the AdWords side. But Anyway, the rest still applies)
Have a look at the Google AdWords and Yahoo/Overture pay-per-click programs. Those are the industry stalwarts for PPC, with the best reach and decent reputations. Then read, read, read about organic search engine optimization. Start with the archives. Keep it clean, try to avoid spammy tricks, which will eventually only turn around to bite you in the arse, and if you optimize well you'll rise in the ranks.
[edited by: luckychucky at 5:12 pm (utc) on Mar. 30, 2005]
If you're looking to add keyword-relevant high-quality content to your website, there are...certain users of this very forum...(wink wink) who write web content at reasonable rates.
See my profile (nudge-nudge).
Yeah, profiles are great.
You have some "computer information tutorials"?
Did you write them yourself? There are tons of them available on the web.
I need good trafic?
To read your tutorials, or to click your ads?
When you really want to make something out of adsense I suggest you start a site really worth looking at. Not just one made for adsense.