I have read lots of post to finaly get it to work, like I did'nt know that I had to publish my news items to get them in the folder and also that I had to allow my folder doctype to add other folder doctype.

For now it seems to be working but I can't have only year/month folders, I'm always getting the day folder witch I don't want.

Here my settings :

<folderProvider alias="DateFolderProvider_Full"
            assembly="/bin/AutoFolders"
            type="AutoFolders.Providers.DateFolderProvider">
      <property alias="MonthFormat">MM</property>
      <property alias="YearFormat">yyyy</property>
      <property alias="DateField">DateParution</property>
    </folderProvider>

Anyone has a clue of I'm doing wrong? Thanks!