What I'd like to do is use a service (should be cheap--$1/month?) that watches my email for a particular header pattern (usually a subject pattern), and sends my phone an SMS alerting me to that message.
(In my case, it's sales messages.)
I don't need "push" email in this case, the obvious solution, as I only really care about a few critical emails.
This seems so obvious, someone should have already done it...