I have seen Skin and it is excellent, up to her usual standard, though large portions of the script are missing from the film version. The final scene, where Neville comforts Billy, is one of those omitted, which is a shame.
I haven't seen 'Skin' though it is a good read. There are a couple of reviews linked from this site.
A while ago I looked into getting it added to the Internet Movie Database, though you have to be a premiom member to add films or shows which is a shame.