QuotaFolder 0.1 released
QuotaFolder is a folder-ish object that restricts the total number of objects, their total size and their individual maximum size. QuotaFolder takes subfolders (recursively) into account, so it should not be possible to escape the quota restrictions.
QuotaFolder was developed as part of Amaze Internet Service's FreeZope.org Free Zope hosting service.
More information, and the product itself can be found here.