We are using Zenprise to monitor our BlackBerry infrastructure and I have to say that the software is amazing. I was alerted immediately when the outage started. When I called Rogers, they did not even know that the RIM network was down (I guess RIM hadn't notified them yet). I agree with JIBI that using monitoring software to identify outages means that we can proactively reach out to our user community before they end up flooding us with calls.

I've included a screenshot of the Zenprise console and one alert message. We were able to see pending messages growing for critical users, as well as immediately identify the root cause to be connectivity problems with the SRP network.