The upcoming iPhone OS 4.0 is gonna have several new productivity improvements including a unified inbox. Having been off, on paternity leave, the last three weeks, I have to say that it was a pleasure not having to check work email on my iPhone. Insomuch that I removed my work email from my iPhone. Not sure how long it can last, but it was comforting to know that the red numeric indicator on my iPhone were only for personal emails. Instead of an unified inbox, I wish I can actually select individual accounts as either push or pull emails.