Chronicle-Recorder and Debugging

This, via several sources: chronicle-recorder records writes to memory and registers using Valgrind, so that it can later answer questions like, “When was location X executed between times T1 and T2?” Tools like this (and rewind debuggers, and the stuff Andreas Zeller and others have been working on) promise to deliver a new generation of super-debuggers in the next few years. Now, would someone please write the damn book?