Hardcore Gmail users have been waiting for quite a few things from Google, but few are higher on the must-have list than this. In the past few hours, the Big G has quietly enabled some accounts with a multiple account sign-in option, which -- as you'd surmise -- allows users to sign into more than one Gmail account within the same browser. In the past, users had to use all sorts of tricks (or worse still, a secondary browser solely for their secondary email account) in order to view various identities at once, but now it's as easy as selecting the option and tagging a drop-down menu. Sadly, committing to this sort of sorcery has i
