The requirements section of wikipedia's page on user interface design refers to ISO 9241, particularly part 10 which has been withdrawn and replaced with ISO 9241-110:2006 - Ergonomics of human-system interaction -- Part 110: Dialogue principles which is a 22 page PDF costing 108 Swiss Francs, ~110 USD or 70 GBP. I'd be interested in hearing from anyone who has read it as to whether it is worth purchasing.
I've read the answers to Does ISO 9241 really matter? but if I have read the Wikipedia page and bluffers guide and I'm going to be reading around the subject from other sources, does reading the actual ISO document add anything?