Honestly, I would recommend condensing down the number of topics. I personally find it hard to manage when new comments come in. Also, usually a good search function makes a hierarchical folder structure an out of date strategy for finding posts of interest. Ironically, email systems are moving towards a monolithic folder structure and rely on great search (GMail, for example) resembling the monolithic forum we just left (minus the great search). I would recommend trimming down to: "Announcements", "Current Products", "Legacy Products", "Other Designs", and "Off Topic".