Move files to folder sorted by year and month with PowerShell

I had to sort a lot of files and put them into folders for each month and year. So for example when the files was created/modified in February 2012, the file had to be moved into the folder 2012 and the subfolder 2 (for February). For this I created this quick and dirty script:

Please as always if you use a PowerShell script from the internet, test it first before you run it against your production environment.