I have been using the imap workaround for Yahoo for the past 4 months and it has worked perfectly. I set up my wife's Eris the same way, no problems.
Today she tells me her email is not working, something about invalid username or password. I told her to let me fix it (figured she screwed it up). I checked, no settings changed, everything looks right. Then I tried to refresh mine and it too gives me the error message and won't refresh.
(btw, I know I could push it to my Gmail but I like having seperate notifications for personal and work.)
Thanks in advance team Droid!
UPDATE-Never mind, it just started working again...wierd.