Yes, there are. In fact, I was going to make a whole thread on various ways you can make money online. I get a lot of PMs about this.
Here is just one of the many:
www.AdBux.org
Basically, you get $0.01 for every time you view an ad for 30 seconds. The neat part is, you can refer other people, and for every ad another person views, you also get $0.01. It's not a scam, and their referral system only works with one tier. You won't make a fortune off it, but I make roughly $50 a month from it.
Here some tips on how to get people to sign-up with your link:
1) Post an ad about it on eBay classifieds. It costs very little to put up an ad for 30 days. Trust me, it pays off.
2) Write articles and post them to websites like Squidoo, or others.
3) Write a blog, and include your link on it. I recommend using Blogger, because it already ranks high in search engines.
4) Put your link in your signature here on the forums, with a catchy phrase, etc.
5) Include your link on your Myspace profile. Copy paste what I wrote here and include your referral link.
There's tons of other ways to make anywhere from $50-$4000 or more per month just from stuff like this online. It's all legit. The reason people think a lot of things are scams is because they never bother trying. The above suggestions may take you a few hours at most. But you'll keep making around $50-$80 every single month after that. You'll have to update every once in a while, but that's it.
Trouble is, most people are too lazy to do even simple stuff like that. They rather sit around and whine about how stuff are scams, when the fact is they're actually not. The people who actually want to make money online will and can, and it's actually not that difficult.