Almost three years after GMail was first launched, Google changed their ways and are now allowing anyone to sign up for the service. For those who have not been paying attention, GMail up to now has been invite only. This hasn’t really been a problem since you could get invites virtually anywhere, but why did it take them almost three years before taking off that restriction? The good news is that in those three years, the accounts have grown by 800MB, so the current limit is around 2.8GB worth of e-mail storage.
Source: GMail