An excellent idea Mark. This sort of indexing work is sorely needed on many message boards, but is rarely attempted, let alone done well.
I think you should not only link to threads. Some threads are long and may cover a number of aspects, and thus there will be occasions when a subsidiary posting would be worth highlighting with a link to the individual post in question.
Some care will be needed with the bookmark title to make it really useful. It wont always be the thread title. Or perhaps an additional word or two will help.
I think this will make a very useful index of knowledge. Better than just bookmarks to be imported into a browser which is just the starting point, we will need it on a web page which is well linked so people are led to the index. Could you put a link to the index as an additional item in the board header? Alternatively create a new top level category called Index. Place one post in it which is your index. Update the post when necessary. Perhaps place a subforum called Index in each of the main categories: Course Measurement, Course Certification Discussion Area etc.