The secret is just hard and regular work (Quality content), and reading seo books as much as you can.
I'll share my formula with you. My formula of good earnings from adsense, is simply domain name and SEO. Targeted visitors usually comes from search engines, mostly from Google. Domain name is one of contributor to SERP value. In my case, my site : sprintringtones.org get 1st position for "Sprint Ringtones" result on Google. Although it's only PR1, but the domain name already told google what my site is about. Honestly, this site is only 1 year old, and it has been at top position since 4 months ago, and never dropped since then. Another tips from me, try to get more relevant backlinks (although it's from lower PR), rather than high PR unrelevant backlinks.
2 practical tips (cos I'm feeling in a sharing mood) 1. Search traffic from Google has never (in my experience) been the best search traffic to increase Adsense earnings. There are a few search engines with reasonable levels of traffic that produce much more click happy visitors. 2. A lot of people try and target high value niches based on Google Adwords data. I never do this, too many people with the same idea/data creates a falsely inflated niche. Instead to get very high value clicks I don't even look at Adwords but concentrate on real life businesses that I know to sell high value goods and services.
let me summarize the thing. Choose the keyword to target.Make a keywords optimized content and then create the do follow back links with the anchor text as the keyword. The greater the number of such back links, higher will be search engine ranking plus traffic and earning.
quality content is key. your not ganna make a lot with some shit site. you gotta put something in to get something out. its just like everything in life. nothing comes easy or free. work hard and u can make $1000 a month when ur 16 like me.
My adsense earnings are very low compared to others. Can any one tell me are there any wrongs in my sites. (sites appeared in my sig.)
I agree with everyone here. There is NO real get money quick scheme. Most if not all of them are scams. Do you research, so you won't get cheated. Be realistic with your goal!
Wow, I really hope people don't listen to this. Search engine traffic from Google does not convert to adsense income? Really? Since when? You must be one of those people who give out advice without any real experience to back it up. Your assertion is absurd. Google has the bulk of the search traffic so if you are not optimizing for Google, you are killing your business. Google's external keyword tool now has CPC data. You should be using it. Go and look at spyfu also and see. The real trick is finding a balance between high CPC, low competition and high enough traffic. BTW, I still don't know if the OP meant $100/day or $100/month. Whatever level he wanted, the story is the same. If you have 6,000 uniques per day and are not earning at LEAST $60/day from this site, you definitely need to do some keyword research ASAP. Small changes in phrases can mean the difference between $0.04/click and $0.35/click or even higher. Whoever said getting backlinks with the appropriate link text is also right on the money. Also, make sure you vary link text. TomG. PS - 1,000 links in 2 weeks for a brand new site is a bad thing, in case anyone was wondering.