Right now I have an iPhone 4, a Galaxy Nexus, and a BlackBery Bold 9900 in front of me. I do dev work, so I flip between devices fairly regularly.

My Bold is still my daily device. Sure, the other two phones are better in almost all ways, but e-mail and unified messaging is one thing RIM knows how to do. At a quick glance, I can see incoming e-mails, SMS, twitter or Facebook, and know if I need to respond. I can set up different audible alerts for each and/or different coloured LEDs.

I rarely have my desktop e-mail client open, since my BlackBerry helps me filter out messages as needed while I work.

You can rally against me if you like, but I like my BlackBerry better than my other devices. It simply works for me. And I think this aversion to e-mail/distractions is a by-product of the devices being used.