The other big news for iOS5 — and yes, I’ve completely buried the lede here, thanks for reading! — two things: completely revamped notifications and widgets.
I’m one of the few that hasn’t really gone along with the idea that Apple needs a new notification system for iOS. They could certainly be improved, but I usually try to avoid notifications whenever I can. But, if Apple could make them less obtrusive and more useful, I could see turning them on for more of my apps.
As far as widgets are concerned, I don’t use them on my Mac and beyond a simple weather widget, I don’t foresee myself using them on my iPhone.