Another way to earn money - premium content

Here is the second good example of selling premium content:
besides it's high unique quality, developers earn money ONLY selling premium content.

Follow up:

Monetization works easy - user just send money via paypal, and his email become the key to unlock some hidden features. Game was created by 2 people, like all of games. First example here was by games masters. I wish the best luck to USA. Well done, guys.

Here is info about other flash-ad-network

GameJacket - a solution for Flash games which allows developers to retain full control over their content, whilst atthe same time generating a steady stream of revenue from high value
advertising. Good points - you always keep control of you swf, and changing version on every portal with one click. They now have promo-period, they offer 0.5$ CPT regardless where your movie have been seen or clicked - that is more then moneyeo.blogsot.com currently offers.
If your game is good, GameJacket will give you 1000$ upfront, if you interested read carefully under cut. Payments that they like to use - paypal but can works with checks.