Stripe is a new payment gateway with no setup or monthly fees that allows you to create fully-branded payment pages. Moreover, using their JavaScript API, you can bypass some of the PCI compliance complexities (including the need for an SSL certificate, although they recommend you install one anyways for consumer confidence). The downside is that there is a 7-day wait period between when a purchase is made and the money is credited to your bank account.
This module integrates with the Pay module to allow easy payments. It can also be used with Webform Pay to add payment components to webforms.

Current Status

This module is still under active development, and should not be used in production (as of Jul 26, 2012).


Known Issues:

Some work needs to be done in Javascript to deal with the Amount field.