Gmail

From the site:

"Gmail is Google's free webmail service. It comes with built-in Google search technology and over 2,600 megabytes of storage (and growing every day). You can keep all your important messages, files and pictures forever, use search to quickly and easily find anything you're looking for, and make sense of it all with a new way of viewing messages as part of conversations.

There are no pop-ups or untargeted banner ads in Gmail, only small text ads. Ads and related information are relevant to your messages, so instead of being obtrusive, they may even be useful for once.

Gmail also integrates instant messaging right into the email experience, so you can stay in even better touch with your friends when you're online. Easy, efficient and maybe even fun to use. It's a whole new way to think about email. It's Google's approach to email. "