Like the previous poster said, you can book a room only reservation right now at the 2007 rates. When the 2008 rates come out, your rates will be adjusted.
I called Disney reservations on June 13, 2007 and was told that the 2008 rates for both room only and packages would be out mid-August.
Someone posted on the Disboards that the rates would be out June 23rd. So, I called Disney reservations again yesterday. She told me mid-August. I asked what was the earliest she had ever seen rates come out and she said July. When I asked about the June 23rd rumor, she said she had heard absolutely nothing saying they would be out that soon.
I plan on calling again, this afternoon, to see what they tell me. I'll post what they say.
P.S. If you want to get a general idea of what the package will cost, you can go online and get a price for this year and add about 17% to it. I was told, last year, that the rates go up between 15% to 18% each year.
Lisa