Wow -- ten years! I've been here since the first months of 2008, when I jumped into the Kindle game. I googled for info on how to use the Kindle, did people like it, etc -- and found Soooo much info here! Initially my favorite forums were thus the Kindle ones.
As somebody else said, now that my Kindle is stable, I stay for the social forums in The Lounge. I don't participate in any other social sites, but the level of general nicety here is just so welcoming. Finding other people who love books, what on earth could be better?!
I can't think of anything to improve the site!