Now you can logon to your Facebook account through several providers such as Google, Myspace and OpenId which IMO is great (I’m lazy). Just go to Settings, Account Settings and Linked Accounts. You can even pick multiple providers. One cool part is my openID provider VeriSign can be setup to use two factor authentication to help provide a little more security amongst all of the chaos. See https://pip.verisignlabs.com
Update 1 - As of now Google as a Linked Account is not logging me in though pip.verisignlabs.com is still working well.
Update 2 - My Google account will log me into FaceBook once I have
authenticated via Gmail.