I am interested in to what changes. I just moved to the iPhone last week after deciding on leaving Android platform. I had many other Apple products except PC. yesterday I signed up for a now 60 day free trial to see how I like it. iDisk is the most likely all I will need. My phone and iPad function off of exchange from my work.
If iDisk is all you need, Dropbox is (for me) a lot faster. iDisk is pretty slow. I like the rest of MobileMe, but I don't really use iDisk because of its speed.