It may feel depressing to open OmniFocus for a review after a week of hard work only to find out that its Inbox is overflowing and the pile of unfinished tasks is the same as a week ago. My anti-depressant in such situations is called OFStats (OmniFocus Quick Statistic by Rob Trew). Yes, there may be the same number of active tasks and projects, but there are also a lot of those that are actually completed! Three bits of advice to go with OFStats.
If you have over 70 projects or over 200 actions may be you should prune your OmniFocus.- On the other hand if you have less than 20 projects (never happened to me!) then may be you are not capturing everything or may be you don’t need OmniFocus.
- You may wish to clip your statistics to a spreadsheet and monitor how many tasks you can typically do in a week or how the number of open projects changes with seasons. Good for planning and reflection.
Thank you Rob!
Academic workflows on a Mac 
Do you know how to install the QuickStats app on the toolbar of OF? Thanks.
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Not sure if you are still interested, but you can install apps on the OF toolbar this way:
http://forums.omnigroup.com/showthread.php?t=11637
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