GMail
Recently came across this service of Google. This is a mail service packed up with a HUGE storage space of 1000MB !! This will be a vast storage space for any individual (provided he hasnt subscribed for various mail groups). He can use it for his life time.

Currently it is in experimental stage and signup is only on invitation. So once it is announced as a public service, we can expect a vast change in the way people view emails.

Google Mail