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RIM has focused on security since they started making the Blackberry. They have encryption built-in, and a bunch of features that help IT guys to manage a corporation's phones. They can be remotely wiped if you lose it in a cab, and since RIM focuses on corporate-features (like a Blackberry server that ties into Microsoft Exchange), it's just a better-managed platform than Android (which is like the wild west) or the iPhone (which is like the evil Empire).
Here's some more info on RIM's commitment to security. I guess the lack of 3rd party apps on their platform also makes their system more secure.