I need to get updates from the orientation sensor about once every 2
or 3 seconds, having the sensor events delivered to a background
service thread.  My options seem to be:

1. register the service thread as an event listener, and throw away
most of the events, looking only at the most recent event every 2 or 3
seconds.

2. register the service thread as an event listener, get one event,
and then unregister.  repeat every 2 or 3 seconds.

Which is more efficient?  In Donut, all sensor activity delivered to
an application element seems to be attributed to the application (even
though it's running on the event thread), so #2 seems like it would
make more sense if you want an app that is going to be recieving
orientation events over the long haul.  I wish that there was a #3:

3. deliver orientation events ever N milliseconds to the following
event listener.
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