I've been using web-based email for years now, first with Yahoo and then Google's GMail. When I had dialup service, it was convenient to download messages and view them offline. But now that most people have broadband connections, it seems like there is little reason to use a POP email client like Outlook, Eudora or Thunderbird.
I can see a little justification for businesses due to intellectual property issues and paranoia about industrial espionage, but why would a home user still use POP email.
Gmail (and probably Yahoo, Hotmail, etc) provides almost 8 Gigabytes of mail storage per user, online management, no backup worries, ability to access your email from any computer anywhere etc. How can POP email compete with that?