Excellent Flex tutorial from Adobe Platform evangelist Miti Pricope on how to combine a Flex application running in Flash Player with PayPal Express Checkout. More than a tutorial, it’s a good little object lesson on things to consider in the planning stages of creating an app, ie security, appropriate architectural solutions and planning the UI. I’ve been looking to post more pointers and tutorials like this which address the trend toward developers making money out of their skills by offering applications for e-commerce sites, especially small-scale ones often run by individuals who need cheap solutions that are easy to implement.