With regards the varying views of 'alright' and 'all right', I consider them both valid.
However, I don't view them as interchangeable. For me the following definitions occur:
All right: Fully correct, correct in every detail.
      "Did you pass that exam?" "Yes, I got it all right (100%)"
Alright: Acceptable
      "Did you get full marks on that exam?" "No, but I did alright."

Alright!: That's amazing
      "I passed my driving test, I can take you to that gig." "Alright!"


Just my view,