As a developer and webmaster of several cs-cart sites, my customers are asking about MasterCard's Masterpass integration. I am mentioning here since it appears to be adopted by many banks and payment gateways... Sage Payment Solutions is the latest offering this solution. I believe this integration should be part of the cs-cart package, not developed as a 3rd party addon
This would be a great addition, I would also request Visa Chekcout, that way our dependence on Paypal alone can be mitgated.