One of my favorite Disney planning books is called PassPorter's Walt Disney World. Great maps of parks, descriptions of rides and descriptions of restaurants. Here is a link to what the book looks like
http://www.amazon.com/PassPorters-W...=sr_1_1?ie=UTF8&s=books&qid=1246980357&sr=1-1
Here is a link to PDF maps on the DIS. You can look at Resort maps and Park maps.
http://www.wdwinfo.com/resortmaps/
I think birthday wise the only discount you would get would be free admission to a park for the person whose birthday it is on that day. I believe you have to pre-register for that. If you buy a Disney package for the whole family which includes park tickets then you get a GC that equals the price of the ticket for the birthday person.
There are other discounts that are often available. Some people get "pin codes" that give them anywhere from 20% to 40% off of room rates. Some people get "pin codes" for Free Dining during those times. How they get the "pin codes" is anyones guess as it seems to be random although some have gotten them after they register to get the Free Planning DVD at the offical Disney website
http://disneyworld.disney.go.com/ Just scroll to the bottom and you'll see an ad for it.
Many times Disney offers a public code for discounts on packages or even Free Dining, that is what is going on now. Book a package by July 21 and get FREE Dining for your stay from September through October. Or, something like that.
Depending on when you stay there are different room prices. Deluxe, moderate, value resorts plus different times of the year. Value Season, peak Season, Regular Season, Summer Season, Holiday Season.
We've been in December for two Disney trips. Lots of beautiful decorations and holiday music. Value season for that time (2009) is 11/29-12/17. That is for all resorts except campsites.(Information from Passporter)
Don't want to overwhelm you so I'll stop there. I think it's easier to answer more specific questions once you know when you want to go, how long you want to stay, where you want to stay (on site/off site), what resort you want to stay at, Dining Plan or no Dining Plan.
Good Luck!