How to make a lot of money online via adsense. By Markus

There are many ways to make money online,  the trick is to pick an area where you can grow virally.  In markets like online dating it is completely packed and no new players have any real chance of competing.  True.com has spent well over $70 million the past 2 years and gone no where,  the main problem is 30% of your user base leaves the site every month and you need huge word of mouth to sustain membership.  Without viral you have to spend $6.00+ per free signup and there is no way to make that kind of money back via adsense.
There are still a lot of makets you can enter where you could generate 20 million a year plus from adsense.   The only problem is that you have to be 1st.  If you are late to the game you need to buy your way in, and that rarely works.
1.  A free monster.com clone,  maybe with a ebay like reputation system.
2.  A social networking/ stock/money portal with a built in digg.com clone to highlight user generated "research reports" or "articles".
3.  (adsense for search) Sites that distribute toolbars,  google is making over  $30+ a toolbar user per year.  The major battle these days are all about toolbar distributions as they are such huge gold mines.  You can create a massive online empire like websearch.com did via funwebproducts.com (its their secret "toolbar install")   13% of my US traffic has their toolbar installed.   (Askjeeves.com bought them)   The lesson here is give away products for free and make hundreds of millions via toolbars.
4. A travel site that lists the top 10 destinations in each city with a breif description about each.  The site would be built on a digg.com like structure and focus on finding great vacation spots/ destinations.     Sort of a trip advisor site taken to the next level.
These are just ideas I came up with in a few minutes,  there is so much money out there to be made,  but so few people are really going for it.   I think its time people stop hyping web 2.0 crap and start promoting real ideas that have real business models.