I went on a last minute vacation to WDW from 5/26/07 - 6/08/07. (I made a reservation for the Princess Storybook Breakfast on 4/25/07, then I planned my vacation around that.

) I was kinda bummed that I called numerous times to try to get CRT reservations, but never succeeded. Then one morning, it happened. It was exactly two weeks before we were going to leave for our vacation. I called just for the heck of it, and what do you know? They had a table available for 3! Granted, my husband and son were not able to go, but the breakfast was mainly for my princess daughter (4). I debated on cancelling the PSB, but decided to keep it since Belle is my daughter's favorite princess, and it was pretty much a guarantee that Belle would be there in her yellow gown.
My daughter loved both breakfasts (well, she didn't eat much, but she loved getting to meet all the princesses.) By the way, at PSB, we had Belle in her yellow gown (entrance only), Princess Aurora, Jasmine, Snow White, and Mulan; at CRT, we had Cinderella (entrance only), Belle (peasant dress), Jasmine, Snow White, and Fairy Godmother.
Don't give up trying!!! Also, in case you didn't know, there are toll free numbers to WDW dining: 800-828-0228; 877-939-3732. Good luck!!!