Another possibility to use your geo-location

How often have you had moments when you created similar events in your calendar:

[21:00] Throw a sandwich from the bag in the fridge - rot.
[23:00] Forget to take a disk for Gosha.

And if you were uncomfortable if the alert about them came at a time when you were not at home? And the next day - the same situation ...
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The idea is to use the geo-position of your phone (communicator) as an additional dimension (in addition to time) about the occurrence of an event.

There may be something like this already exists, but the authors clearly do not seek to advertise their product. If there is a solution, share it.

Ideally, you need to create a set of plug-ins for the main calendars for WinMobile, iPhone, Symbian, Android (I think it will be possible to effectively use the new Google Geolocation API technology). As a basis for making a decision on finding it is possible to use information about the nearest cell phone towers (in Symbian this is definitely possible) or data from the GPS module (available in many modern phones).

Having “taught” my calendar at least in such places as Home, Office, Dacha, I would make my life easier by 0.5%, I suppose the rest too. The idea is modern and relevant.