Yes, I am curious too and I dug around a bit in the Wiki and the FIFA's own site. Here is my little finding:
FIFA is split into six confederations (UEFA, AFC, CONMEBOL, OFC, CAF and CONCACAF) which oversee the game in the different continents and regions of the world.
For the 2006 FIFA World Cup, the FIFA Executive Committee decided to allocate the following number of slots to the confederatons:
* UEFA (Europe - 52 members): 14* AFC (Asia - 46 members): 4.5, competes for the 5th slot against CONCACAF
* CONMEBOL (S. America - 10 members): 4.5, competes for the 5th slot with OFC* OFC (Oceania - 11 members): 0.5
* CAF (Africa - 53 members): 5
* CONCACAF (N, Central America, Caribbean - 40 members): 3.5
The FIFA Executive Committee consists of:
President - Switzerland
Sr. VP - Argentina
VP's - Scotland, Sweden, Cameroon, Korea Republic, Trinidad and Tobago, Spain
Members - Belgium, Costa Rica, Brazil, Qatar, Turkey, USA, Thailand, Paraguay, Botswana, Mali, Russia, Germany, France, Tonga, Japan, Tunisia.
The Organising Committee for the FIFA World Cup forms groups and/or sub-groups for the preliminary competition by seeding and drawing lots whilst taking sports, geographic and economic factors into consideration, as far as possible.
The Organising Committee for the FIFA World Cup is appointed by the FIFA Executive Committee.