I love email. It's amazing. It's better than a letter (other than the sheer joy of getting a letter in the mail) because it's nearly instantaneous. It's better than a phone call because you can really think through what you are saying and word everything exactly right. It's better than instant messenger because there are no long pauses while you compose the perfect message. You don't have to know that the recipient is right there waiting for the message because you know they will get it eventually.
And it's great when you just get the urge to hear from someone that you haven't talked to in a while. A phone call in that situation might be a little odd, but an email? It's so easy! "How's it going? I haven't heard from you in forever! Such and such is going on in my life etc."
Not to mention that it's practically free. If you have access to a library you can have free email. Otherwise you might have to pay for the internet connection (hey I wouldn't complain about having internet!) and you can send music and videos over it. No stamps, no long waits, and no awkward pauses.
I can't wait until they can figure out how to send other stuff over the internet. Like people. Or groceries. Instantaneous travel and grocery shopping. Brilliant.
PS Some drawbacks would include that it doesn't offer the vocal tone that a face-to-face or phone conversation affords, so that does leave some speculation as to intended meaning at times. And another would be that if it's urgent you better make sure they know that it's on it's way.