One of my requirements was a reliable weather feed which wouldn't break my site. To make things easy and efficient I wanted it to be an XML feed. Weather.com happens to provide a feed free of charge.

Here's how it works: you need to sign up for a Partner ID and License Key. In a way, they are your public/private keys. Once you register, they email them to you. You will need these Partner ID and License Key to place queries to their server(s). The whole process is very easy. When you register they allows you to download an SDK, but you don't need to worry about it unless your want to develop your own module.

After that, Download can be found on my CodePlex Project.