Blame Google Account

This story tells how a developer spent some time figuring out how to sign up code.google.com, being lost between "Google Account" and "Gmail Account". Below is a Goolge produce laundry list and its authentication method.

Google Checkout: Google Account
Google Code: GMail => Google Account(it asks for Google Account but acctually only GMail works)
Google co-op: Google Account
Google Blogger: blogger account
Google Calendar: Google Account
Google Doc and Spreadsheet: Google Account
Gmail: Google Account (it says "Sign in GMail with Google Account" but acctually if you use Google Account to login, it tells your Google Account can't be used in GMail. )
Google Groups: Google Account

I guess Google is in the process of moving all login to Google Account, but still wants preventing GMail spam.