SharePoint 2010’s UI is designed to work well on mobile devices. It also senses if you are on a touch device, such as an iPhone and puts the links slightly apart so they are easier to touch. If you create a SharePoint site, here is how it looks OOTB.

Basically it’s taken you to the All content page. Smart move I think!
Lets visit the announcement’s list.

Wow, so I can add a new announcement, set filters, and of course existing announcements are visible too.
How does the calendar look?

Oh sweet! Well okay, it isn’t quite the iPhone calendar you’re used to. But I don’t see it being very difficult to add an ical or ics to a SharePoint calendar list. And really, then you’d get full iPhone integrated calendar experience.

And here is how you can add new calendar appointments right through your iPhone. NICE!