Googles marketplace for software for Android, the Market, probably support for payments via PayPal. Currently in the app store only to be paid with a credit card that Google Checkout is linked.
Recently leaked version 3.3.11 using the Android Market. This version includes several new features, including the option to have all apps automatically update, which can be set that this is only over a wi-fi connection, can be done. In the source code of the new Market are also cross-references to the payment service PayPal.
PayPal support would make it possible to without credit card applications from the Market to buy something through Google Checkout is not possible. Google has officially published anything about a cooperation with PayPal.