Mmmm good thread!
Personally I don't cook main courses on the camp fire, however my brother is a total traditionalist and cooks (and sometimes incinerates!) steak and chicken etc on the embers of a camp fire.
I take a proper barbecue, although my brother ridicules me saying "Why do you bring charcoal to a wood?"
I find a barbecue rather more predictable! However I do cook spuds and sweet potatoes in the embers of a camp fire.
As far as recipes go I think keeping it simple is important. For meat eaters meat marinated in lemon juice, olive oil and your favourite herbs and spices and then grilled is a sure fire winner, as is chicken and bacon kebabs (the fat from the bacon stops the chicken from drying out).
For veggies kebabs of tomatoes, mushrooms, onions and capsicums go down well. Garlic bread is nice but a little difficult to judge whether its on a fire or on a BBQ.