Hello All!!! It looks like my next trip to WDW won't be until spring break of 2008

but we were there this year at that time and had a blast! My question is: how far out can I book my resort reservations? I know a deposit is required and I CAN make payments, correct? Also, if I remember correctly, all has to be paid in full a month before our trip?
Thanks to all of you for your help!!