I have online game that I want to sell - I developed it and I don't have time to spend on this project anymore, it's earning some money from SMS payments now, but it can be easy configured to work with paypal and etc. It's strategic game - you can make building, upgrade them, make wars, soldiers, knights and etc, make bands and etc. something like imperia online.
If you are interested - I can give you a demo in PMB :)
The site is fully PHP + MySQL, OOP code -> clean and commented.