I like where Michael Schechter is going with this tip, setting Keyboard Maestro to open OmniFocus every 90 minutes, because I too often forget to check what’s in there until it is too late.
What I don’t like is the forced nature of the tip — I don’t want a window popping up if I am in the middle of something that I truly don’t want to interrupt. So I fixed it: my version of his KM macro just pops a Growl notification on my screen every 90 minutes that reminds me (gently) to check OmniFocus.
I just created this so I am not sure how it will work long term, but I really like the idea.