I’ve put together a module for Sitecore that extends the default Workflow Workbox.

Main features are the ability to filter items by the currently logged in user, as well as a feature to group items at “page level”. Page level means that if you have several datasource items under a “Page” item in sitecore, they can be grouped together in the UI and submitted together using a new Workflow Action.

Source code can be found here:

https://github.com/blacktambourine/Sitecore.WorkboxPlus