Switching from a Blackberry 9630 to an iPhone 4

I've had a Blackberry since the inception of the 950 Internet Edition. I made the switch to the iPhone 4 mostly because of the problems I've had with the BES server at my current job. Every 15 days or so, I'd stop receiving corporate email. The 'fix' was to delete & re-add my account to the BES server. I got tired of needing someone to do that, and figured now was as good a time as any to learn a