The activation procedure I followed was identical to a single user activation. I tried reactivating using my old .Mac username, but MobileMe was unable to connect it to the current password. I wonder if a .Me version of the old account is in limbo with an old password*.
So I have a distinct iTunes/Apple account and MobileMe account. That’s probably a good thing.
The first account you use is the Master account. So I am the Master of my family. That’s nice.
In Settings I configured my Mail to 1GB (it will not be used) and iDisk to 19GB. The Family Pack comes with 20GB of storage and a 200GB monthly data transfer limit.
It turns out that package description is misleading. I thought there were four MobileMe accounts. It appears there’s 1 Master account (20GB) and four minion(?) accounts, each with 5GB of storage. So total storage is 40GB. I don’t know if the 200 GB data transfer limit is for the master account or for all accounts.
I put a reminder in ToodleDo to renew a few weeks ahead of the displayed expiration date.
* So if you discontinue a MobileMe account, you may wish to keep the last good password around.
Update 10/21/09: See MobileMe- Perspective of a crusty Palm veteran, a review I wrote in July 2009. Back then I was able to get my original .Mac username and convert it to me.com, so I should have tried to claim my un with a .me extension.
Update 10/21/09b: You can remove family member accounts and thus recycle them. It's in the Account Options menu.