Again, thank so much everyone!Depends on your skin type. I have very dry skin and don't use ANY powder or drying stuff on my skin, just a setting spray to hold it all in. But there are oily people out there who couldn't live without powder.
What is your colouring? It makes a huge difference to correcting depending.
In response to your question, my colouring is medium to fair I would say. I use NW22 foundation from Mac if that helps at all.