The NY Times David Pogue reviews GMail for Mobile, Yahoo Go 2.0, and Teleflip this morning. The premise? Anyone can have the email capabilities of BlackBerry on their existing handset. Of course, he also points out that Gmail Mobile doesn't refresh the messages until you open it, Yahoo Go 2.0 is big and slow, and Teleflip delivers your email in 120 character SMS packets.
My advice David? Get a BlackBerry.