IPhone – way to have the iPhone suggest corrections but not automatically apply them

You could create a smart playlist that excludes files that are already included in another playlist.

So, in your case if you generally sync a playlist called "At Work" whcih contains what you normally sync, but then also throw a few others into the sync too, you could create a smart playlist that looks for any ticked track that is not already in the "At Work" playlist. Call this "Adhoc" or something, and add this to your sync list, and you should have a new playlist that shows anything that wasn;t part of your original sync list.

When sending group message to iPhone users, you don't actually send an MMS or SMS, you send an iMessage (sent messages will be in blue bubbles instead of green ones). When sending iMessage to more than one person, you create a group chat, and everybody will be able to see all the conversation.

To actually send an MMS/SMS, you can disable iMessage in the Settings before sending the group message, then re-enable it later.