I'd like for SMS to go into some type of holding pattern and be automatically sent when there is signal. Sometimes I don't reply to my messages right away and when I do, there's no signal. I still have to go back and try to resend the message. Most of the time, I forget to go back and resend the message when I get to some place with signal. It's a basic feature for SMS to go into the outbox until it is sent. At least my L7 had it. I hope Apple fixes this. Maybe make the bubble a different color - red maybe and then have it turn green after it has been sent.
Yeah, this is also really important for emergency situations. Since 9/11 when people had trouble making calls from their cell because of the towers being overloaded, I've read a couple of articles that have advised people to send a text message instead, because most phones put the text on "hold" until the next available signal. Also better because texts put less of a strain on the network, leaving the cell towers more available for emergency responders. Definitely something Apple needs to implement!
Also would be nice for when I'm on the Metro and don't have a signal...