Congratulation MR, ten great years (although I can only personally vouch for the last three and a half).
I originally joined to find out more about my newly bought e-reader. Thanks to Mobileread I've been able to unbrick my reader, install PRS+ and discover Calibre (amongst many other things). I've also found some great free books in the Patricia Clark Memorial Library, always beautifully formatted by people who really care about books.
Nowadays, I mostly hang out in the Llounge, great for relaxed, civilised conversation. My favourite thread is the Silliness Quiz
thread. I love quizzes anyway and the erudite, international membership of MR means I'm always learning something. Thanks to everybody who posts there!
Hopefully, many more years to come. Thanks to Alex and the mods.