MailPlane is a Gmail cient for Mac OS X. I’ve been using it for few weeks, and must say that I’m really loving it. Yesterday it was updated to 1.46, this latest version supports multiple Gmail accounts. Now I can switch between my Gmail accounts with a click. It has a sleek mac look, supports drag and drop attachment, comes with an iphoto plugin and many more… currently it’s in private beta, if you want to try it, go and register here, you’ll have to wait for your turn, they’re sending 100 invitation each day.
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