I wonder what the exact time-window is, because I am also unable to delete previous posts (since pg made this mini-announcement).
I wonder when/if it's going to be possible to delete your YC account (and all related information).
Digg promised this feature at "The Future of Web Apps" but it has yet to materialize (on Digg), I believe.
Does anyone know what the situation at reddit is wrt control of "your own personal information"? :)
I really am curious as to when the Web will evolve policies and products that adequately address this concern/"feature request."