Dave Caolo on how great location based reminders are:
If you had asked me to describe what I want in a perfect reminder app, I’d list simple task creation, dependability, multi-device sync and so on. That’s exactly what Guy describes: I listed my desires in terms of what I’m already using. I never would have said, “Place a geofence around a given location and prompt me to act upon arriving at leaving that spot,” but it turns out that’s precisely what the perfect reminder app should do
This works really well with OmniFocus — I only wish they could also make OmniFocus work with Siri.