Congratulations on 10 years. I could hardly imagine all that we have now back in 2002. I've since given away my hundreds of paper books and gone completely digital.
My favorite forum is Amazon Kindle, as that is the reader I have. I think it could be improved with some aggressive pre-emptive moderation to curb threadjacking and trolling, particularly in emotionally-charged threads.
I've also greatly benefited from the deals section (love the Kindle coupon thread) and the free ebook forum, where skilled amateurs have put together public domain works of exceptional quality, growing my collection in the process. It is also a major bonus to have Kovid Goyal posting here to respond to any questions about Calibre.