Dude, it's definitely Gmail. Their new system of referring to emails as conversations is really convenient if you're into the correspondence and don't just use email for mailing lists and suscriptions. Now if you send an email and the person replies, it still counts under the same initial conversation so it's relly convenient, you can just scroll up or down to recall what they or you've previously said. And the reply feature is in the same window as the conversation itself. Coo! Moreover, who can deny that Gmail offers one of the biggest attachment size limits amongst other free email providers? Plus the 1gig of space is a real treat, especially if you use programs like Peer2Mail that can help you backup your files conveniently.And they have pop3 access too, now. Coo!