I’m thinking that the iPhone OS should have something that supresses notifications when I’m near my desktop computer. This should be possible because the Bluetooth knows when I’m within my desktop’s proximity. This will prevent my desktop machine and iPhone simultaneously alerting me to a meeting invite.
When I’m away from my desktop the alert is warranted, but when I’m at my desktop machine it’s redundant (not to mention annoying).
UPDATE 1: @naveen mentioned http://code.google.com/p/reduxcomputing-proximity/ sort of does this though I want the iPhone to disable it’s updates because it’s usually in my pocket.
UPDATE 2: Airlock (http://themha.com/airlock/) is also a possibility, but still desktop-based.