My point about skype was not that it cannot be backgrounded, but as I said "skype will be integrated in a way that it takes your desktop space". Not sure what happens when you have more accounts - if you can do that at all and if it continues adding new bars... but I prefer it completely invisible like in N900 (especially when I have 2 voip accounts and 3 more voice-capable xmpp accounts online)

I doesn’t take anything. The double high status bar is a standard UI convention of iPhone OS. It appears when something requires your interaction and is in the background (like ending the call or stopping the voice recording).