Hi Diz
Manure is a great thing to add to the compost heap, it acts like a booster and speeds up the composting process, not to mention adding heaps of the 3 main nutrients (N, P and K). I wouldn't use fresh manure on plants as it can actually diminish nutrients from the soil during the rotting process. Comfrey on the other hand can be chopped and dug directly into soil.
Pig manure is high in potash (K) especially, and Phosphorus so suits root crops such as your carrots. When we have pigs I would often go and collect a few shovel fulls of manure to pop in the compost. Pigs are clean creatures and tend to 'toilet' in one area, so collection is easy. Chicken manure has the highest measure of the 3 nutrients.
We put all manure we can find into the composts around the farm, though we find that anything with wood shavings needs 2 years rather than 1. You shouldn't be able to decipher any shavings when you look through it before use and it should be sweet smelling.
Don't discount humanure either, though it needs special treatment, nothing complicated. It just needs leaving in the heap for 2 years to ensure any pathogens are dead, the high temperatures of thermophillic composting ensures this. To read more about compost toilets and tree bogs read my new post here
http://sallygardens.typepad.com/sallyga ... oilet.html and try to get your hands on a copy of the Humanure Handbook, my local library ordered it in for me. Humanure is the ultimate in recycling your waste and minimising your impact on the environment, I defy anybody who has '1. read the book and 2. used a compost toilet', to think anything different.
Compost is a lovely craft. Enjoy it and reap the benefits.