So, the latest update. The newest book of the last 20 I read was not available on Kindle, while the one that fell off had been, so the ratio falls from 70% to 65%, with 13 of the last 20 available on Kindle. For reference:

1 – NO – 9 Ways to Bring Out the Best in You and Your Child
2 – YES – Shadow of the Hegemon
3 – NO – The Visual Display of Quantitative Information
4 – YES – Ender’s Shadow
5 – YES – The Elegant Universe
6 – YES – Children of the Mind
7 – NO – Introduction to Algorithms
8 – YES – Xenocide
9 – YES – The Geography of Bliss
10 – YES – Speaker for the Dead
11 – NO – First Break all the Rules
12 – YES – Ender’s Game
13 – YES – Until the Sea Shall Free Them
14 – YES – Foucault’s Pendulum
15 – YES – Java The Complete Reference
16 – NO – Harry Potter and the Deathly Hallows
17 – YES – The Audacity of Hope
18 – NO – Harry Potter and the Half-Blood Prince
19 – NO – Data Mining
20 – YES – The Children of Hurin

And there we are for the moment.