Combine Your Email Accounts Using Gmail
One of the coolest features of Gmail is the ability to send email (or at least appear to) from any email account you own.
Under the Settings tab, you can add any email account you own. After confirming it you can now change the "from"¬Ě email address in any message you send.
Combine this and email forwarding from any other account you own and you now have a single place you can check all your email.