Just a suggestion for features that I have seen on other boards that are very user friendly. The first is to have the thread start date with the thread title. You have the date/time of the latest post, but not the start date. For me, I look for new threads and tend to passover threads I've read or are not relevant. The start date helps.
Also, I've seen a hover feature that allows you to put the cursor on a thread and a small box with the first 20 or so words of the first post on the thread. This allows a glimpse of the thread to help you determine if you'd like to read it or not.