PS script to find jpg's, mov's, other files in user network share

Greetings EE!  I am preparing to migrate our workstations from XP to 7 and part of the project's early stages is the file server clean-up which includes the network shares for our users.  With 250+ user folders, I figured this would be a good time to use Powershell for something besides tutorials and start using it in the real world.  Here is what I need to do:

1- Audit how much space (overall in the "users" directory) is being occupied by non-work related file types such as jpg's, music files, video's, etc.
2- Get the overall parent folder size for each user
3- Report of the file size in XLS

The network shares are under the \\fileserver\users directory (users is the name of the directory and share name).

Like I said above, I have been learning Powershell and this is my first non-training wheel, real-world script project.  It would have been great to start with something small but that isn't state gov for you.  Your help is appreciated.