Here we list some usefull links.

Parks

Official site of the Serengeti national park  : http://www.serengeti.org/
Ngorongoro national park: http://www.ngorongoro-crater-africa.org/
Tanzania National Parks official site:: http://www.tanzaniaparks.com/

Transportations

International Airport : http://www.kilimanjaroairport.co.tz/

Hotels and Lodges

http://www.tanzania-adventure.com/lodges_tanzania.html
http://www.thesafaricompany.co.za/Lodge_Hotel_Tanzania_Arusha.html
http://www.karama-lodge.com/
http://www.kigongoni.net/