Howdy,
I too thought that I would have the same problem - being addicted to email, no matter where I am.
In order to stay sane I have it urn on at 7:30am, and off at 7pm, weekends on at 9am, off at 5pm.
Its on silent, so no beeps, vibrations or whatever.
I carry a seperate cell phone to make and receive calls.
I leave the blackberry at home when not at work, but when I am at work I just check it occasionally, and use it for email when I want to read email. And of course I use it for the diary - linked into outlook.
For example I am on Holidays for the next 3 weeks, and guess what its nicely in its cradle at work.. :-)
stuart