From today (07 Dec,2012) onwards free Google Apps sign-up has been stopped. The only two option available now on Google Apps website are Google Apps for Business and Google Apps for Education.
Google floated a notice to its existing Free Google users about this change in service. However existing Free Google App customers will have no impact on their account and can continue without any change. This will impact only new account registrations.
This change was expected as in recent times Google was cutting down on services given to free accounts. Finally free Google App service came to a halt.