Most Helpful Girl
I ran out of room for my books so at the moment they're shoved in a box in whatever order I could fit them in. I don't have any DVDs but my old but my old Sims 3 CDs are in another box at the top of my closet, I believe they're arranged from newest to oldest.
Most Helpful Guy
I usually organise it by the size of the books because its so annoying to see big and small book side to side