Today, at the PayPal conference, Sun and PayPal announced that PayPal will now be a payment option for the Java Store. To read about the announcement and all the details, check out this article. Additionally, the Java Store and Warehouse are now live.
To get the client (i.e. store): http://store.java.com/developerrelease
Developer Portal (i.e. warehouse to upload client): http://java.sun.com/warehouse/