Stripe, a wonderful developer-friendly payment gateway, just became even more useful: there is now a WordPress plugin for it, Super Stripe.
You can now securely accept credit credit card payments on a WordPress site without PCI compliance headaches like a SSL certificate, security scans, maintenance routines, and so on. All that stays with Stripe and is now readily available to you through an easy to install and configure free plugin.
2 excellent, no fluff articles from the PCI SS Compliance Blog:
PA-DSS Implementation for application developers and integrators
How to Become PCI Compliant for merchants
Knowing the deadlines for the Payment Card Industry Standards (PCI DSS, PA-DSS) is critical for merchants, developers, and payment service providers alike. Unfortunately, card brands who enforce compliance have different deadlines and even different levels for merchants and service providers.
This comprehensive list for all payment card brands not only has deadlines and levels, but also links to each brand’s PCI compliance program: