Advice wise, take a good sleeping bag if travelling from the months of May to june, as it can get really really cold at night ( this is coming from a Scottish girl so you have been warned), also take a good head torch as well !
You don't need to take as many clothes as I though, you have the chance to do some laundry at certain stops.
Take lots of memory cards for the camera and batteries or a charger as you will go through them in no time.
Charging facilities on the van are great ( our van was provided by Mabaruli) with everyone being able to charge the ipod at the same time !
Money wise, the trip notes state to take most in Sterling or Dollars, I would say don't!
In Capetown my Clydesdale Bank Sterling £20 note was not accepted as they said it was not English? and all the places you go to accept Rand. I would say take Dollars to Livingstone Zambia as most of the activities are paid this way and most of the shops charge in Dollars as well.
If you get the chance, and its a full Moon, go see the Lunar Rainbow, spectacular !!
The food is amazing, the people are friendly and its a trip of a lifetime go and Enjoy all of it !