My issues have been resolved.

Google is having issues with IMAP in Gmail. The fallback for now is the web interface.

Others are seeing the same thing, including premier subscribers.

IMAP broken

One person has reported that IMAP is fixed. I am not seeing this fix yet. UPDATE! Once I logged out and then back in, I could see the new interface again with IMAP enabled.

IMAP fixed

Here is the official Gmail blog, though there is no word yet about the outage.

Gmail blog

The Digg – nation has caught on.

digg.com