I've been a bit stop/start on my decluttering but KonMari has definitely got into my head. Even in shops if I pick something up I ask myself if it brings me joy. And usually the answer is nope. 
I've been concentrating on some bigger things through the house that have been weighing me down. I've sold a few things on gumtree/facebook and thanked them on their way to new homes. Also sent some furniture to the hospice furniture place. I'm in the process of deepcleaning our bedroom in readiness of starting Konmari proper.
With our CDs we had them ripped onto a network storage device by Ripster. It was really worthwhile as we still have the music but no CDs. It's connected to our speaker system by wifi and accessed via the ipad.
Someone asked about leads and cables. I've rolled up my kindle charging cable and put it inside an empty loo roll tube and put it in the drawer with my kindle. It works great as a storage method. I have a huge basket of leads in another room and I've no idea what they are for so i'm going to recycle them. In the event that I throw away something crucial I'll just have to stump up for a new one.
One of the barriers to me decluttering in the past has been me thinking that I could sell the item but inertia has meant I haven't sold them and they're just lying there occupying space and sapping energy. My plan now is to only sell items I know will sell quickly and locally. Recycle/donate/freecycle the rest. In her book, MK says something like, you lose the monetary value of the item when you buy it so don't bother trying to sell it.
My DS has Konmari'd his books and most of the stuff in his bedroom by using the does it spark joy question. He has a pile of about half the stuff in his room. He's 10. DD is 6 and claims every single piece of plastic brings her joy. So I need to do some more work with DD.
I folded DHs socks Konmari style and I'm staggered at how many pairs he has. If asked I would have said 10 but I counted 20 and that's not including the ones in the laundry process.
I'm enjoying reading about everyone's progress.