Hi guys, don't mean to be ultra confident but its the truth:

infolinks performs better than Kontera, just Google it and see why Publishers choose to switch from Kontera. Infolinks is the fastest growing in-text ad provider in the industry with MUCH better fill rates. I'll be happy to answer your questions, just email me: orenc@infolinks.com!

www.infolinks.com.

It's mostly advertising :(

Adsense / Federated Media (premium publishers only) - Banners (CPM - CPC)

Kontera / Vibrantmedia (Underlined keywords - CPC)

Amazon Affilliates / Chitika (Product Offers - CPA)

Picads Media (beta) (Ads on images - CPC)

I think it all depends about market, niche, industry you are covering with your blog.

If you are a hardworker, if you have a very special knowledge, if you want to learn a lot and work a lot of money could arrive after a certain period of time, at least 2 years of very hard work. Your objective must be only one: Be the Best, be the most reputable in that niche that you are covering.

You can get much more with a % of products or/and services that will be sold within your Blog than with tons of ads with a low CPM.

Over again: less is more.

If you want to monetize your blog, you should check out Darren Rowse at ProBlogger, it's all he talks about.

Well, I'll say bloggers have mainly 2 sources of income: 1) based on the traffic they get, making advertising money. Problem is: you need a heck of a lot of traffic to make some money 2) based on the reputation in the industry, you could make money several ways: as a consultant, as a speaker, maybe as an author. But technically that wouldn't make it a revenue source from your blog, but as a result of it.