I should note that I also recently transitioned my account to a full Google account. I'm not positive that transitioning my Google Apps account to a full account is the root of the cause here, but it's been quite a bit of hassle since I made that move.
About a week ago I was simultaneously no longer able to login to my Gchat through Adium, Pidgin (on a different machine), and mail/calendars on my iPod Touch (which is configured as an Exchange account).
Things that have not worked are the CAPTCHA unlock, resetting the password, re-adding the accounts... Double checked the configs on everything and I have a parallel non-transitioned Apps account accessing these services on the same machines, with identical configs, perfectly normally.
Sort of at a loss as to what to try next. Any suggestions?