I'm dubious about the premise of this breathless article from AP reporter Martha Irvine that text and instant messaging is set to replace email for younger internet users.
It's certainly true to an extent but the real emerging technology of the future will be universal messaging, the same email, the same buddy lists, etc.
I have it right now with my Motorola Q and a little bit of hacking. Once push email becomes common for non-business users (as every wireless provider is desperately trying to make happen), so will everyone else.