From Google’s Gmail What’s New page:
Now Gmail can check for the mail you receive at your other email accounts. You can retrieve your mail (new and old) from up to five other email accounts and have them all in Gmail. Â
Sweet, so Gmail can handle ALL of my email now without me having to forward the emails to Gmail. Too bad this is only available on a limited number of accounts currently. Going from the experience I had with the last Gmail feature (Gtalk), I should be one of the absolute last people on the planet to get this feature.
Read the setup directions so you are ready to implement it once your account is enabled.