My first module

Hello,

I made my first drupal module in 2 days.

One of my client asked me for a website where he could share files easily and nicely with clients, without the hassle of learning ftp, access control etc etc...
He wanted a system where he could add himself users and shares files with them privately.

I used drupal for it's website, added the upload module and make my own module to let him choose to witch users he's gonna share the node.
My module add to the site a new content type.
When you add a node, you have to choose with witch user you want to share it, if no user is selected, the node is free to view to everyone.
You can also select more than one users of course.
Also, each users have a small control panel in their tab, where they can see wich files are shared with them and files they share with others.
The module uses it's own table.

This is my first module in drupal, I'll made some new in the next days but I needed to make something easy in the beginning :)

Here is the link to my module, I hope you'll like it! http://www.pol-dev.be/filesharing.tar.gz

I'm currently busy making the translation and polishing the code.

I need feedback ! What can I improve ?

Thanks !