Amazon has added something called Auto Rip, which not only dumps mp3s into your version of their Cloud Player as you buy CDs, but also roots around in your old Amazon purchases and dumps eligible cuts in too.
I activated it yesterday. It only gave me 133 tracks, but even so …
And one of the nice things is that some of the cuts I got were from CD presents to other people. So I just made a playlist with a lot of Frank Ocean (present to my son’s girlfriend) and Melody Gardot and Gretchen Parlato (also presents).
Personal downside: I must have given my son the CD “Iowa” by Slipknot at some point. Sheesh.