Just to add a little more detail ...
The pricing for Disney Resorts for 2009 has not been released yet. As a result, the website will only allow you to input dates through the end of 2008. There shouldn't be any availability showing up for 2009 -- the fact that even FW came up confuses me.
You can make a room-only reservation now for March, but you have to do it on the phone. If you call Disney, they'll reserve a room (and you'll pay the one-night deposit) based on 2008 holiday rates. Also note that no discounts can be applied yet. When the rates come out for 2009, you can call back to have the new rate applied to your room-only reservation or change your reservation to a package. In 2007, the rates for 2008 were released in August.
If you prefer to make reservations online at the Disney website, you'll have to wait until the rates are released.