According to an e-mail we just received (other Writely beta users should also have received this e-mail), Google will soon be switching the Writely online word processor (a company they acquired back in March) application to be accessible only with a Google account. This should take place before the end of the week:
In a few days, we will update your Writely account to use your ———-@gmail.com Google Account registration settings.
This means you’ll need to use your Google Account password when signing in, not your Writely password (if they’re different).
If you’ve forgotten your Google Account password, just go to https://www.google.com/accounts/ForgotPasswd
Google Writely Team
Update: It appears as though this change has taken place…Writely.com is now prompting for your Google Account credentials.