Hi,
It's a common fault that for some reason, gmail no longer pushes since iOS 4.2 and no one really knows why, anyway, I thought I'd pass on that you can get gmail to push once more by not adding it as a gmail account, but adding it as an Exchange account. Set the server as m.google.com and you're all set. Works very fast too, if anything much faster than before.
cheers,
malty
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