Congratulations on 10 years. Have come to this site every day since finding it.
As for my favorite forum it would have to be Recommendations. I like hearing what others are reading and why and that is where I get most of my ideas for my next book to read.
If I had one suggestion I would say have sub forums broken into genres. But that is being nit picky and me wanting to make it easier to sift through the stuff I have no interest in. Or maybe genre forums in general. Mystery forum, sic if forum, etc.
Congrats again and thanks for starting this.