A wasp nest has developed in my back yard, so I have a couple of questions...first a photo.

Name: wasps_nest_1.JPG Views: 12649 Size: 69.2 KB

You can find a larger photo here

My questions:
  1. What type of wasps are these?
  2. What do they eat? i.e. are they good for my garden
  3. Will the nest continue to grow? It already has over the past month.
  4. What is the best way to handle the nest? Remove, do nothing?
  5. How do you remove a wasps nest? (safely that is...)
  6. Who are the people to call to do this? (if necessary) I am in Bellville, Cape Town.