Having a website is like drinking coffee these days. Anybody can have a website. With websites offering preexisting templates, cheap hosting, free blogs its easier then ever having a website.
Lot of people have websites just for fun. Many tries to earn few bucks off the site. To mention Google AdSense, Yahoo, MSN are few choices to earn money.
With pay per click ads placed on your site you get paid per click. More the clicks more you earn. So its come to the point that ads are placed in a place …

There are many services you could use on your site to make few bucks. Here is a small list to get you started.
Google AdSense
Bidvertiser
Text Link Ads

Kontera

WidgetBucks
Chikita
Clicksor
AdBrite
Yahoo Publisher Network
Adbux.org
Some of them pays more then others; you have to find the one best suit your needs. I personally use Google AdSense on some of my sites, works ok for me.

You can earn some money working as a Google Contractor. Or you could have your business details shown on Google Maps.
Joining the Google Local Business Referrals (LBR) program is a great way to earn some money while connecting people to the businesses in your neighborhood. The information you collect could be seen by millions of people who use Google every day. And you’ll be helping the businesses you refer attract new customers while also making it easier for people in your community to find the products and services they’re searching …

I am not a “How to make money” guru. But I will tell you some ways I have been using to earn a few bucks from your blog.
Affiliate Program
Affiliate programs generally pay 5-10% or so for any sales made by any visitor to your site. A good place to put the affiliate links are BlogRoll. When you choose affiliate programs best idea is to pick something related to your site content.
Google/Yahoo/MSN Ad Networks
Search engines like Google, Yahoo, MSN offers ad networks like AdSense etc which you can use to show …