While most of the enhancements added to 4.4, which was released on December 24th, were related to performance, there were a few enhancements added to help users who host multiportal sites. These enhancments can be broken down into two categories; Usability and Control.
The Portals Host menu module has been enhanced to provide alpha-filtering and paging. Previously to version 4.4 all portals were returned and listed in this module. This behaviour made in almost impossible for us to use this module on demo.dotnetnuke.com to manage portals as the list became unmanageably long, very quickly. As a result we had to wrote a scheduler job to remove old demo portals.
In 4.4 we added apha-filtering and paging, similar to the system used in the "Manage Users" admin module, so that only 20 portals display at once.
A number of users, use dotnetnuke as a "hosting" system. We have always had a Disk space quota. In 4.4 we have added a Page Quota and User Quota. Like the Disk space quota this can be set as a default at the Host level, so it applies to every site. However, a host level user can modify the value for any site, once created. In both cases, attempting to to add a new Page or a new Users when the quota is reached will give a friendly warning (similar to the behaviour if the Disk Quota is exceeded.
This behaviour should provide users who re-sell this kind of hosting the flexiblity to control the type of sites they would like to offer.