Hello to all of You!
I've joined Mumsnet just to be able to write on this Thread
As my username states, english ist not my native language, so please excuse any mistakes I make 
Read about Kondo somewhere on the internet, did my clothes, got the book, read it, found this thread (and the 8 before), read all these, struggled ages with books (small kids, illness an holidays as an excuse) and am now procrastinating because I don't feel like doing cds and dvds and have not yet managed to get the books out of the house. And dreading paperwork, so no incentive to move on quickly.
I'm not following Kondo to the dot, though. I've kept a small "to think about" pile of both clothes and books, and I've bought storage.
My excuse for the storage beeing that it is a chest of drawers in the same design as our wardrobes, I've wanted it for quite a while and I got it really cheap second hand.
On the positive side:
I love opening my clothes drawer. All those t-shirts and underwear, nicely folded and ready to be picked. It's absolutely great!
My dc liked it so much as well, we did his clothes too, and so far (5 or 6 weeks) they stayed tidy.
We do the folding a little bit different so it fits the drawers/boxes better.
Due to getting rid of all my unloved skirts, I was forced to repair the hem of a very much loved one that has been in the "mend" pile for over a year. Took me 10 minutes and I've been wearing it lots since. Feeling very stupid now, wearing skirts I don't like for a year when 10 minute with a needle would have let me wear one I love.
Sorry, very long post.
I'm so excited to 'talk' to people about Kondo though and share my experiences.