I used to be in the unpleasant situation of having to carry around an iPhone (personal phone and email) and a Blackberry (work phone, email, on-call pages). On

I used to be in the unpleasant situation of having to carry around an iPhone (personal phone and email) and a Blackberry (work phone, email, on-call pages). One of the advantages of the Blackberry is that you can specify a filter for priority incoming email, and have a different set of notification preferences for high-priority email. So I had my Blackberry make noise and blink if I had monitoring alerts, but not if I just got normal email. That was useful.