Hot off the press, Amazon AWS has yet another new web service. This one is called DevPay and is squarely aimed at entrepreneurial developers. Frankly these guys are punching out web services by the dozen.
I particularly like this service as it allowing the developer to further focus on the applications and leave the business aspects to DevPay. Developers can enable applications using other services like S3, EC2 and SimpleDB. Once the apps are ready they can use DevPay to sell them with creative business models.
Many web service providers end up using credit cards or PayPal, which require some effort to configure appropriately. Not to mention security and privacy hassles when dealing with credit card transactions. Seems like DevPay simplifies all that.