I think Mark mentioned it, but the reason for the 6 months release cycle was to be able to work mostly on creating a new release as opposed to updating the current one indefinetly. Since the only patches we get are security ones not feature ones it is good that any release is only 6 months behind the times. A one year release schedule would force updates to software aside from security.
yeah. I really like the 6 months release cycle and Ubuntu proves that it is efficient.