I've mentioned before, quite simply that Monopoly and PayDay are great ways to teach your kids about money. As it so happens, the October issue of 'Family Fun' magazine has many more interesting approaches and games recommended.
My 9 year old daughter is reading it right now, she was kind of annoyed that I was peaking... I won't scan it due to copyright issues. I suggest you order it, or pick it up a the library or store.