Calendar AP

Background: I use a Palm Tungsten E2 for my calendar. I'd like to find a calendar AP similar to this to use on my BB 8330. I'm self-employed and I like that I can colorize my different clients so I know at a glance where I'm working. The calendar on the BB is ok but doesn't really do what I need it to do. Is there some way to use it that I don't know about. I'm still figuring things so maybe I'm just missing something when I'm playing around trying to get the calendar to do what I need.
Thanks for your patience with a newbie & someone who's not too computer savvy but is learning.
Pam