Use this widget to sell to your readers

Lemonade.com offers a revenue share store front where you can select a general category of products to sell to your readers. The product list includes offerings from major retailers such as Wal Mart, Netflix, At&t iTunes and more.

Lemonade says that you, as the publisher and promoter of your stand, will earn 80% of the commission from each sale. Your PayPal account will be credited each time you reach $10 in earned commission. Some of the wording on the Lemonade site indicated that you might be paid simply for clicks on products without an actual purchase. Maybe I am reading this incorrectly.
So here is the text as found on the Lemonade site:

Visitors to your web page or profile will see your lemonade stand and click on the products and offers that you recommend. Each time a visitor clicks on or buys something from your lemonade stand, you make money. As a lemonade stand owner, you keep 80% of all revenue generated (from retailer commissions, leads and referrals, and advertising placements from your stand and we keep 20% for setting up all of this stuff and making it super easy for you. When you reach a minimum balance of $10.00 we will credit your account via PayPal.

Flash widget
The Lemonade Stand is a Flash widget. So it is conceivable that you can earn money right from your Myspace page. Lemonade comes with Facebook integration built right in. So now you can easily earn a few $$ from your Facebook profile.

Lemonade.com