I actually just installed Agendus on my Blackberry and I love it! I already used the calender/task functions on it, but I like how Agendus consolidates it and makes it easier to use.
I also use my BB to keep up with news, reading blogs, looking up stuff, weather (I use WeatherEye)...oh and of course, the texting, emails and calls.
Is there anything this marvelous machine can't do?