Some basic information on optical equipment, field guides, etc. for safari
Binoculars
Basic Information on choosing binoculars
Types and terminology
Brands
Top end... spendy, but great optics!
Leitz, Swarovski, Zeiss
Middle ground... lots to choose from. I personally rank Nikon above the rest.
Nikon, Baush & Lomb, Bushnell, Pentax, Olympus, Celestron
Budget... be very careful if you go this route!
Tasco, Brunton, Binolux, Barska
Spotting scopes
Cameras
Film
Point and Shoot
Single Lens Reflex (SLR)
Polaroid/Instant image
"Disposable"
Digital
Point and Shoot
SLR
Underwater
Field guides
Birds
Field Guide to the Birds of East Africa: Kenya, Tanzania, Uganda, Rwanda, Burundi by Stevenson & Fanshawe
Birds of Kenya and Northern Tanzania by Zimmerman et al.
Mammals
The Kingdon Field Guide to African Mammals (Princeton Field Guides) by Jonathan Kingdon
The Safari Companion: A Guide to Watching African Mammals Including Hoofed Mammals, Carnivores, and Primates by Richard D. Estes, Daniel Otte
Fish
Not too much available on this subject. Here is general list of "fishy" guides for different parts of the world.
Reptiles