[CJefferson]

Experience tells me that Apple will integrate iCloud deeply into all their Mac OS X applications, and many 3rd party apps will use iCloud by default, and not offer alternative options (such as Dropbox).

Will I be able to write apps for Android which can access data stored in the iCloud? I will be very, very surprised if we can. Similar to how it is very difficult, verging on impossible, to sync my Android phone with iTunes.

Apple clearly do not want their systems to integrate nicely with others, except where they feel they really have to. The iTunes / Blackberry problems from a few years ago proved to me that Apple will do anything it takes to stop interoperability, except where they want it.