1 Introduction.- 2 Extrasolar Moons.- 3 The Transiting Planet.- 4 Timing the Transit.- 5 Transit Distortions.- 6 Transit Timing Effects due to an Exomoon.- 7 Detectability of Habitable Exomoons with Kepler-Class Photometry.- 8 Conclusions & Future Work.- A Notations & Acronyms.