I've been happily using Google Mail's IMAP from my iPhone up until about half an hour ago, when I got given a "Account does not support IMAP" message from my phone. Fair enough, I think, I have to log out and log in again - but when I went to the settings page, my Forwarding and POP/IMAP is now Forwarding and POP. No mention of IMAP at all, no reference to it anywhere even with the steps I used to set it up last time. And now suddenly, it's gone.
Conspiracy or cock-up? Seems I'm not alone.