Loose ends:

- Either we had a regression or I missed it, but Ch1 Exercise numbers 9-26 need to be incremented by 2 (in link text and in Discussion titles)

- Exercises 9 and 67 still need Discussions to be created

- The Ch 1 exercises still contain a number of cross-refs (to Examples, other Exercises, etc.) which need updating. I guess most of these are in Exercises <= 28. If Discussion owners could check for these that would be nice:-)