Well the one big thing I have been looking forward to in iOS5 is the Notifications Center. I use my iPhone now literally as a personal assitant - but the one thing that annoyed me the most is that my old Windows Mobile phone handled notificaitons and reminders so much better, I hated everything else about it - but it did those very well especially when integrated to my Outlook. So for me - this new notifications center is a HUGE leap from a prodcutivity standpoint.

-Rob