I use GAE as well for all my side projects. I recommend a service such as spreedly or recurly for billing.I've used PayPal subscriptions and 2checkout in the pa

I use GAE as well for all my side projects. I recommend a service such as spreedly or recurly for billing.I've used PayPal subscriptions and 2checkout in the past but they suck. For design I recommend the minimalist approach such as letter.ly until you can hire a designer.