I am not saying you’ll be a millionaire but your website should earn enough money to support itself. Every website is capable of this.
Below are the best programs (in my opinion) to help your website earn money online.

Google Adsense

Probably the best in my opinion, Google AdSense delivers relevant text and image ads that are precisely targeted to your site and your site content. And when you add a Google search box to your site, AdSense delivers relevant text ads that are targeted to the Google search results pages generated by your visitors search request.

Bidvertiser

BidVertiser is a cost-per-click bidding system that allows you to advertise text ads on sites of your choice. Simply create your text ad, choose the site(s) to advertise on, set the maximum price-per-click you are willing to pay and your ads will instantly start appearing.
Sign up for Bidvertiser

WidgetBucks

WidgetBucks does the heavy lifting by creating contextual ad widgets that your visitors will actually click on and find engaging. They also have a very high click value. Unlike Google AdSense, you only need to make $50 to get paid (AdSense is $100). Payments are expected to arrive in 45 days.
Sign up for WidgetBucks

Text Link Ads

Make more money by selling text based ads. A normal website usually gets $15 for every link sold per month. If you sell 8 text links every month you could be making $120.
Really easy to use code. Just insert it to your website and the links are automaticly sold and updated.
Sign up for Text Link Ads

TNX

Selling links on each pages of your website is very easy with TNX. You just sign up, add your website and the code (after website approval) and just wait. The best thing about it is that you can sell up to 4 links on each page of your website. Just imagine: if your website has 1000 pages you can sell up to 4000 links per month.
You can add the links throughout the page and this way it won’t look like you’re selling links.
If you are afraid you’ll get pwned by search engines for selling links don’t worry. With TNX nobody will know you do that.
What … can you see the links I’m selling on Sava’s Place ?
Sign Up For TNX

Kontera

This is an absolutely brilliant concept and an atrocious implementation of that concept.
Kontera can easily be used on any website. Just insert a little code in every page of your website and it will scan for keywords. In case there are paid keywords on your website Kontera will automatically link that word to a paid advertisement.
Sign up for Kontera

If you like writing you will surely like these other 3 money makers.

ReviewMe

ReviewMe is one big marketplace in which advertisers can order sponsored reviews from bloggers. Based on your site’s Alexa ranking, Google PageRank, RSS subscribers, and Technorati ranking, your review prices can be as low as $30 or as high as $2,500. Other than getting paid to blog, bloggers can also make money by writing a Campaign review. It works just like PayPerPost’s marketplace, but the chances you can get and find one is very little.
Sign up for Review Me

PayPerPost

Get paid for blogging. Write about web sites, products, services, and companies and earn cash for providing your opinion and valuable feedback to advertisers. Disclosure required.
Sign up for PayPerPost

SocialSpark

SocialSpark is a Social Marketing Network that connects advertisers and bloggers through an online advertising marketplace. Advertisers are able to target blogs based on conversational topics and make cash sponsorship offers to the bloggers who publish them. Bloggers can make money by either placing display advertisements on their blog or by writing sponsored content. The sponsorships offered through the SocialSpark marketplace allow advertisers to build buzz, generate traffic and maximize social media exposure.
Sign up for SocialSpark

Of course there are other money makers out there. These are the ones I use and you can be sure you will make money with.