I want to deliver WordPress powered packages to some users and want them to have:
- a limitation on disk quota (/each user)
- A way to measure/show how many MBs they are currently using
Any solution would be appreciated
I would use a multi site installation for this. Give each user their own blog.
Multi Site has built in disk quota functionality, and you can see how much of it is used and such in the admin area of each site. You can set the quota in the network admin:
Combine that with domain mapping allowing your users to have their own domains and you've got a fairly powerful system.