Allowing end-users to sort meta box fields is pretty straight forward. These two screencasts will show you how to quickly setup sorting as well as how to setup a simple notification message to alert users to “Update” the post/page.
This release introduces two modes of operation when creating a WordPress Meta Box: Array Mode and Extract Mode. The default mode is Array and will typically work well for the majority of users. Learn how and when to use Extract mode.
Support for two key features make this WordPress meta box PHP class even more attractive. With the addition of filtering and repeating fields, you have even more flexibility when using meta boxes for your themes and plugins.