Thoughts and musings.
A brief look at how one can upload images to Twitter and Facebook (through their respective APIs) and then attach them to a Tweet/status submission.
The Paypal PHP SDK is surprisingly simple, and extremely well documented. Learn how we implemented payments on a web application in a matter of hours.
Versioning within an API is vitally important. As is designing a safe and future proof client. See how we went about implementing both when building Mmmm.com