Here are 2 digital distributors steam and Humble Bundle (links further down).
Lets talk about there cut of the funds raised.....
Steam - They take around 30% after tax of your monthly sales, they also might add extra charges that are talked about when you first get passed the green light stage.
Humble Bundle - These take 5%, thats it just 5% of your monthly sales you host the game from your website and sell it by there widget.
Humble Bumble store - If selling through there store they take 25% of your monthly sales but give 10% of that to charities.
Summery:
It would be great not only to include the steam SDK into skyline but also the Humble Bundles API Located at
If your cleaver you would use both companies to distribute your game as they are both known world wide.
