PHP programming forum. Ask questions or help people concerning PHP code. Don't understand a function? Need help implementing a class? Don't understand a class? Here is where to ask. Remember to do your homework!
There are many services that offer the functionality through the web, but you must pay for it. It's usually only worth the price for companies that need a lot of website thumbnails generated. And, just an FYI, most of them use IE's engine to generate the thumbnails.