Let google do the work for you

Selling ad space might be the oldest way to make a buck, and with Google's free AdSense service (www.google.com/adsense), it's way too easy. AdSense allows bloggers to display up to three content-specific "ad units" (boxes that can hold up to four ads each) per page. "If you're writing about sports cars, they'll be ads about sports cars," says Biz Stone, Blogger senior specialist at Google. Each time a visitor clicks these ads, you get paid. Google doesn't disclose its exact share of the revenue, but a personalized report page lets you track your own earnings. Earn at least $100 and Google sends you a check.