Congrats Behrsmom, Singaporemom and Rengland!
Son's status changed to "Offer Extended" on 2/25/10 (last Thursday) and we are still waiting for the appointment package from USNA (nothing came today). Others have reported waiting about 10 days, so I'm not worried yet, but it will be good to finally get the official paperwork.
BTW, we've had no letters, emails or phone calls from MOCs or BGO's (for USNA appointment offer, or USMA apt. offer that arrived Feb. 1st) - so like everything else, they all seem to do it a bit differently.