Alexanderc

Many people make quite a bit of money by filling out surveys and participating in online studies.

There are numerous websites that offer this kind of work, and it can be quite lucrative.

Look into surveys. Lots of online survey opportunities exist.
It is an easy way to make a little extra cash.

You can while you sleep. If you have a passive income, you don't have to put any effort into it.
You can earn this type of income by running an online forum and placing advertising banners on it to earn money.

Blogging is a popular way to earn money online. If you do it for fun, why not profit from it?
Ads on your blog can bring in a tidy little income.

Try freelance writing as a form of online income.
There are many websites out there that open up the doors to freelance writing, like oDesk and eLance. With both, you can apply for and bid on online jobs of all types.

Blogging is a great way to make cash online. If you're already blogging for fun, think about turning your blog into a cash cow.
Advertising is the primary money maker here. Whenever your readers click an ad, you get some money.