Having a Disney dumb moment here....

[Lakin]

Will someone remind me how far in advance rooms can be booked, and how far in advance dining can be booked? It seems to have slipped my brain...

[MMFreak]

I think rooms can be booked up till the end of the year it may be a bit longer than that but when the new year dawns then you have to update your room price with the new cost if there is a differance (there always is) and dining is normally 180 days out but if you have a reserved package it is 190.

[caryrae]

For our trip for Sept/Oct 2009 I booked our rooms in Aug 2008.

[KylesMom]

and dining is normally 180 days out but if you have a reserved package it is 190.
I just want to add a clarification to this statement. If you are staying on-property, you can book 180 days out from your check-in date, plus the next ten days of ADRs for your trip. Technically this does not mean that you can book your dining at 190 days.

This is not only for packages, but for room-only reservations as well. You'll need to have your reservation number available to book the 180+10.

[Strmchsr]

Carol clarified the dining nicely. I know that room only reservations can be booked 400+ days in advance. I'm fairly certain (but not 100%) that packages may only be booked once Disney has released the package pricing for that year, which usually comes in August before the upcoming year.