It can be really had to keep up with all of the Twitter and blog data that is generated every day on the topic of Revit. However, if you have the time to skim through the main Revit blogs and tweets, you will likely find something that will increase your productivity.
In the interest of sharing, here are a few links that may help you get started –
Another blog list:
Revit OpEd: Blog Listing – Revit Focus
Revit chat (IRC site open to guests):
Crowd sourced content list