I'll be getting them on my bday, August 15, and will post the exact experience after that. I am hoping that all of the below is true, pasted in from this site:
My understanding is that you get somewhere from 2-4 passes for the Donald (E-Ticket) and Daisy (D-Ticket) side.
http://www.oinc.net/disney/fastpass.php#Birthday
What is a Birthday FASTPASS?
One kiosk will always be open for Birthday FASTPASS users As part of the new "What will you celebrate?" theme starting in 2009, if you are attending a Disney park on your birthday and do not need to take advantage of the free 1-day base ticket, you can opt for a special Birthday FASTPASS card for you and up to 5 other guests with you (all must be present and have a valid admission ticket). Note that a limited number are available per park per day, and may not be available after 11am. You might be able to get more cards depending on availability, but only 6 are guaranteed. You also should register in advance and bring the confirmation sheet with you. Start here for more details and other Birthday options.
Note that this information could change at any time.
The Birthday FASTPASS takes the form of a card that would be inserted into the FASTPASS kiosk instead of your park ticket, and would give you a FASTPASS with a Return Window that starts immediately. These cards do not give an unlimited number of FASTPASSes, however, and they are only good at the park at which you received the card.
The FASTPASS attractions are divided into two groups. The most recent list is as follows, but are subject to change. You will receive a list of the attractions with the FASTPASS card:
Magic Kingdom
Donald: Big Thunder Mountain Railroad, Many Adventures of Winnie the Pooh, Peter Pan's Flight, Space Mountain, Splash Mountain
Daisy: Buzz Lightyear's Space Ranger Spin, Jungle Cruise, Mickey's PhilharMagic, Stitch's Great Escape!
Epcot
Donald: Soarin', Test Track
Daisy: Honey, I Shrunk the Audience, Living with the Land, Maelstrom, Mission: SPACE
Disney's Hollywood Studios
Donald: Rock N Roller Coaster, Toy Story Midway Mania, Twilight Zone Tower of Terror
Daisy: Lights Motors Action Extreme Stunt Show, Star Tours, Voyage of The Little Mermaid
Animal Kingdom
Donald: Expedition Everest, Kilimanjaro Safaris
Daisy: Dinosaur, It's Tough to Be a Bug, Kali River Rapids
In general, you will get at least 2 FASTPASSes per card from each group - that is, two FASTPASSes for any combination of Donald rides, and two FASTPASSes in any combination of Daisy rides. The actual number has varied between two and four FASTPASSes per group, depending on the park and potentially expected crowd levels.
In addition, some people have reported not being able to get more than one FASTPASS at the same attraction with the same card, but as of last report this is allowed - especially since there aren't necessarily four attractions in a group.
Even if all the regular FASTPASSes are gone, you can STILL get an immediate FASTPASS using your Birthday FASTPASS card - there will be one kiosk left open for this purpose.
Note that using the Birthday FASTPASS card in no way affects your being able to use your regular park ticket to get regular FASTPASSes. You can use both independently, and your ability to get FASTPASSes with your park ticket follows the same rules as always as to when you can get another FASTPASS.
Disclaimer: All information has been obtained from various sources, including Disney's official web sites, various community forums, and personal experience. Disney can change operational aspects at any time that could make this information incorrect or invalid, and information could simply be incorrect, but every effort is made to insure that it is correct and is updated as soon as changes are known.
