As is nowadays well-known, the Libor market model (LMM) is the standard model we use for pricing and hedging interest rate derivatives. There isn't one single Libor market model though. Differences (quite often significant) occur as a result of the calibration procedure(s) applied. It is therefore important for practioners to understand fully how to calibrate such a model.
Schoenmakers' book describes LMM and its calibration aspects very well. It is really a must-read for quants who deal with the implementing of LMM on the trading desk.