I am a complete WDW junkie so if you have any questions just let me know. Actually my wife and I will be there Oct 3-12th myself (along with my brother and his family and my parents) - we are staying at the Beach Club Villas (we are members of the Disney Vacation Club).
As mentioned above wdwig.com is an excellent reference. I would also point you to
http://www.intercot.com for a very good forum filled with fellow WDW fans
Ok now for some general thoughts/tips/etc:
A 5 day park hopper will allow you to see just about everything, but the key to WDW is to plan. You don't need a "at 5:30 we have to be on Small World" level of planning but a general gameplan and tour order. The parks are BIG. Very Very Big in fact - if you backtrack it will cost a lot of time and wear and tear on your feet.
Plan on taking some breaks - if you are staying on property head back to your hotel in the early afternoon to avoid the hottest and busiest hours of the day. Then head back to the parks. Another option is to plan and make preferred seatings for a sitdown meal for lunchtime.
It is hard to find a bad meal at WDW but a few favorites if you are looking for a great meal: Le Cellier Steakhouse (Epcot in Canada), 50's Primetime Cafe and The Brown Derby (MGM), and Boma at Animal Kingdom Lodge (especially for breakfast).
The first 3 days I would do full day Epcot, full day MK, a morning at AK and evening at MGM and then use the next two days to go back to your favorite parks.
Also there are Mickeys Not so Scary Halloween Parties going on then so you may want to look at them also.
anyway that is enough of this book - let me know if you have any specific questions
