Ps statistical physics is slightly weird, not sure about a good book. Maybe Berkeley physics course vol 5 or so.
About the Landauer principle itself I remember the paper actually to be quite accessible.
http://www.av8n.com/physics/thermo/entropy.html
Some core ideas :
- 19th century modern thermodynamics are hopelessly obsolete (at least if you want to understand the "why" and/or do stuff more advanced than "basic" heat engines ?) with tons of confused notions like "heat".
- The term "thermodynamics" itself is bad, "energo-informatics" would perhaps be a better one ?
- Entropy is just a redundant term for (the lack of) information about a system (= macrostate = distribution).
- Hence, you need at least some quantum mechanics : Heisenberg's unsharpness principle (and Plank's constant h) to be able to build the theory from the microstate up, because you need to be able to quantize position and momentum to define information.
- disorder is another of those misleading terms