I know awhile ago suggestions were being welcomed, and I was just now perusing the Geeks' Lounge to see if there was anything interesting, worth replying to...
One of the balancing acts is to walk the fine line between a forum being too large and general vs. too narrow and splintered, I know - but have you ever considered instead of the one forum (ideally with a better title), a few forums for different subjects - like leisure (movies, books, etc.), current events, work, cyber-related chat, etc.?