They are not releasing their 2008 dates until August. Current rumor puts it at about the 5th. Try back then. Just know that there will be a rush to call WDW and TAs that day with everyone that has been waiting to book their 2008 trips. I have a room only ressie already. If you call by phone, they will hold a room for you at the 2007 rate and then adjust the price when they get the new rates in. At least you will know you have a room no matter what. If you want a package, you have to wait unitl August.
Good luck.