Blackberry Logbook?

I’m a pumper and it’s really helped me to use MiniMed’s logbook for tracking food, blood sugars, exercise etc. However, I’d rather go the electronic route so I don’t kill so many trees. Any ideas on e-logbooks that are decent? I’m debating between a Blackberry and an iPhone but will probably get a Blackberry.

i use a pocket PC, easily links to my PC for outlook.

I use glucose one for my Palm TX