Google has released a tool to help identify and separate important email, based on user choices and Google's search algorithms. I have not yet set it up, but you can get good overviews and tips for using Priority Inbox here and here.
For a less technical, broader view of Priority Inbox, the Google Enterprise Blog has published an interview with David Allen, noted productivity expert and author of Getting Things Done. Allen sees Priority Inbox as a tool to manage the information overload this Blog began discussing earlier this week, by helping to determine "(1) what kind of attention should I be paying to something, and (2) once I have put that attention on it, what do I do with it?"
Creately: If you create pictures, charts or diagrams, you might consider looking at this product. Very simple to use, with lots of templates, and it allows collaboration with other users. The free product is somewhat limited, but pricing is very reasonably tiered.
Overcoming Stress: Marginally NSFW, but as usual, the Onion says it best, tongue planted firmly in cheek:
Overcome Stress By Visualizing It As A Greedy, Hook-Nosed Race Of Creatures