Pen and paper, my friend, pen and paper.  I generate a LOT of scrap paper so I wind up writing this sort thing down... I wound up having to get one of those portfolio-style books just to keep them all in.  Now my scattered notes look FANTASTIC.  But in there is a list of all the DVDs I need to buy, books I'm missing, books I'm interested in reading, and audiobooks I haven't listened to yet.