Wrong user name password at imap.gmail.com

If you suspect an account has been locked out due to mistyped passwords, the account can be unlocked by going to a captcha page.

https://www.google.com/accounts/UnlockCaptcha

or Google Apps for Domain

https://www.google.com/a/[yourdomain]/accounts/UnlockCaptcha

e.g.

https://www.google.com/a/projectliftoff.com/UnlockCaptca