I really am crushing on the professional designed binder and dividers etc. that Shannon at wdwprepschool.com designed, but not all binders have to be that deluxe. I have made two different versions that are more like the Smash book styles that are popular with scrapbookers.
The first one I did from scratch and made the pages from letter-size card stock. each page was 5.5 x 8.5 inches (I rounded the corners for a little nicer look). I made some pages that folded out so I could add photos and trinkets etc as I went along. I also had pages for dining, hotel, airplane, etc. that could be filled out by hand and added some journaling space. I added stickers and rubber stamped images throughout the book.
I took a small scrapbook kit with me with the plan to work on it each night. Didn't happen! I staggered home so late every night after the fireworks etc. that I just flat out died the minute I hit the bed.
The second book I did is a standard composition book with Mickey paper added on the covers and inside pages to make sections. I also used a lot of stickers and rubber stamped images and brochures etc. I again added pictures throughout after the trip. This one is more compact and I think I like it best.
The third trip I took in 2012 (I know, it was CRAZY!) I didn't make an official planning binder. I just picked up a small bound journal with Mickey on the front and used it to make all of my notes and lists and record reservations etc. My plan was to do some actual 12x12 scrapbook pages from this trip. Haven't quite got around to that yet but it was only this past Halloween.
Anyway, you can take a look at my books on the disneyscrappers.ning.com site:
http://disneyscrappers.ning.com/photo/album/listForOwner?screenName=2zpj58yetfhfz