Mobile Applications - The Economy Is Changing Fast
Dress up as young teen girls and carry cardboard cutouts of your pet.
Facebook Applications: If you are a application developer then there is no limit on the earning. This is not to say that the developers of these games aren't out to make money. Cross-platform HTML5 apps, non-Apple tablets, and interactive TV will be big in 2011.
You can make some interesting applications and can let people use them.
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