There's a neat way to enable push email on your iPhone so you can be notified of emails when they arrive, just like a BlackBerry. Push email has long been available with the IMAP idle command, though not many clients seem to support it. Getting the new push program on your iPhone requires that you jailbreak your phone, so if you need push email, you may want to hold of on tomorrow's firmware update. The software is still in beta but apparently still works as advertised.
