+1 for Pocket Informant. I had it for Windows Mobile and it was the most powerful PIM app I had used. I don't the same functionality exists for the BB just yet, but I believe it has a lot of potential
I tried Agendus for Palm at one point in time and it was so, so.
I'm looking for an app that uses sound principles from some kind of renowned self-help contingency like that of Franklin, Covery, Ziglar, etc. I came across this app for windows mobile and Palm called DayNotez. It's along the lines of what I'm searching for. I'm also looking for an app like Quanto (by same developer), which basically graphs time usage into trends.
Natara Quanto time measurement tool for the Palm Computing Platform