Delete any apps you don't want others know you downloaded or be linked to you immediately. If your wifi name for some reason is something sensitive rename it. The address book/sms one is tricky, maybe make a backup of your iPhone and if you're truly paranoid delete all your contacts and sms messages and restore them when Apple releases a patch?

This is truly a massive fail on the part of Apple and I hope there is as big of a backlash from their users.