  Recently, reliable mass estimates for the central black holes in AGN became
feasible due to emission-line reverberation techniques. Using this method as a
calibrator, it is possible to determine black hole masses for a wide range of
AGN, in particular NLS1s. Do NLS1s have smaller black holes than ordinary
Seyfert 1 galaxies? Are their black holes smaller compared to the sizes of
their host galaxies? Do they have larger L/M ratios? Do NLS1s have hotter
accretion disks? I confront these questions with accretion disk theory and with
the data, showing that the above may well be the case.
