Recursively Getting All Folder Sizes

This started out as my entry for Event 8 in the Microsoft Scripting Games 2009 (see more entries here), but it's useful, so I think I'll keep it. This function uses recursion to work its way down the directory tree and get all folders and their sizes, and outputs them as psobjects for easy sorting, etc. It's not the fastest thing in the world, but it does the trick. Make sure to check out the examples in the help documentation.