CPC (Cost Per Click Advertisers) – These sites let you place ads on your site that when simply clicked earn you money:
Google Adsense
Adbrite
Chitika
Kontera
Clicksor
CPA (Cost Per Action Advertisers) – With these sites your web traffic must click an ad and then follow an action (usually a purchase):
ClickBank
Commission Junction
Linkshare
ShareASale
Max Bounty
Amazon
CPM (Cost Per 1000 Impressions) – With these companies you will earn a set amount of money for every 1000 displays of an ad. Note – most of these sites require a certain high amount of traffic per month before they will approve your site.
Burst Media
ValueClick
Tribal Fusion
If you want to start monetizing your current website, or build a website that is monetized from the start – check out the options above and you are sure to find some sort of offer that you can use to make some money.