I have added a search feature, that enables you to search the discussions on this site. There is now a small search box at the topic of each forum. You can also use the advanced search.
I have also increased the number of "pages" of forum topics that you can access, enabling you to go further back into the past to read (and reply to) older threads. Note: the page links at the bottom of each forum are not "smart" - if you get a blank page, that means there are no more threads to view.
I hope these features are helpful.
Also, I know that a lot of people would like to see paginated topics - breaking long topics into multiple pages - that one is a little more difficult to achieve, but I do plan to do this when I have more time.