vip mail
If you've upgraded your iPhone to iOS6 then you may have noticed the VIP mail setting in the email fuction.
For users it’s a way to flag certain contacts as VIPs and have their emails appear in the special VIP section in your mail.
Simply put, this means you potentially never miss messages from people that you want/need to hear from.
Priority mail has been around in Gmail for a while, of course, but VIP seems extra handy as it's device based and it's super-easy to aggregate contacts from different accounts for the non-geeky.
This is not to say 'email-is-dead' but is further testament to the idea that effectiveness of communication correlates directly to the existing level of permission.
Another nail in the coffin of unsolicited spam, and a pointer to perhaps a renaissance for email as a viable channel.