I'm probably going to install iPhone OS 4 beta 4 today or tomorrow. Supposedly, this beta is stable and fast [crossing fingers]. It's likely the new email client is going to set a new standard. Anyone remember Google Wave? Well, my opinion is if someone were to take the best of n900's Conversations, Google Wave, Google Talk (including video chat), Google Voice, and this latest iPhone OS email client (including multiple exchange support, and possibly provisioning), we would really have something. I predict it will happen in the next 12 - 18 months, and Apple will reject the iPhone OS version.