Which is the best introductory textbook for Bayesian statistics?

One book per answer, please.


Question: Any equivalent to CCleaner for Android?
Answer: Yes.  SDMaid does an excellent job of finding files abandoned by the system such as interrupted Play APK downloads (cutely called the "basement corpse finder"), shrinking databases and emptying your caches.  It also lists files by size so you can find space hogs, etc.