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Well, I'm really glad this happened... Google has finally gotten push email for GMail accounts. Sure, it's using the Microsoft Exchange connector in the iPhone OS 3.x, but still, that's a lot better than the polling I had to do in the past. Also, the Yahoo! push email was very unreliable in my usage. Sometimes I'd get emails in a minute or two, and sometimes I wouldn't get them until I opened up the Mail app and it scanned for me. Far too unreliable to use everyday.
But with GMail Push, I can (and did) move my iPhone email to GMail and then redirected the forwarder on iphone@bobbeaty.com to the new GMail account. Then, by following these simple instructions, I was able to get my GMail on the iPhone. Very nice.
When I sent a test email from my laptop to my iPhone, it arrived in less than 3 seconds. Amazing. You can't beat Google for good engineering. Thankfully, I used the domain mail forwarding so that changing the underlying email account was easy and didn't effect the stream of emails. What a sweet deal.