PLEASE NOTE: To everyone with a separate MobileMe account and Apple ID
I've seen numerous, numerous threads already about this and I'm just a basic lurker!
A lot of people are "complaining" about having a MobileMe account and a separate Apple ID. They use their MobileMe account (name@me.com) for e-mail/contacts/calendar etc. and their separate ID for iTunes and the app store etc. (e.g.
name@gmail.com,
name@yahoo.com). People asking what happens when they switch to iCloud and they have two separate accounts and won't be able to use them both separately anymore. Well, perhaps I'm just being ridiculously stupid (and honestly, there is a very, very, very high chance of this! But if it helps anyone, then it is worth a shot...) but you can change your Apple ID e-mail address to any e-mail address you wish -- and have been able to for some time

I've done it myself on 2/3 occasions already, months/years apart.
https://appleid.apple.com/
Click "Manage my Apple ID", login with the account you currently use for iTunes/app store etc. and then once logged in, you can change your primary e-mail address from
you@aol.com or whatever your Apple ID is currently set to, to be your MobileMe ID i.e.
you@me.com. A verification e-mail will be sent to your "new" e-mail address (in this case your @me.com) address and then you should be done.
Relogin to iTunes/app store etc. with your @me.com address, which is also now your Apple ID. Your purchases etc. are linked to your Apple ID account, not the actual address you type to login, so they should work fine. You should just have to relogin to iTunes etc. (It may take a few hours for the chances to propagate).
I'm NOT saying this definitely will work, and offer absolutely NO guarantee whatsoever, but -- it's worth a try. I've changed the e-mail address associated with my Apple ID numerous times and it worked fine. Used to use a @msn.com address for my Apple ID, then I upgraded to @me.com so I changed it to use that for my Apple ID, now I use Gmail so I changed it to use Gmail as my Apple ID. When iCloud comes, I'll switch back to using @me.com.
Like I said, no guarantees it will definitely work, but having changed my 'primary e-mail address' associated with my Apple ID three times in the past, i can't see what the fuss is about
