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I review how AGN black hole masses are calculated from emission-linereverberation-mapping data, with particular attention to both assumptions andcaveats. I discuss the empirical relationship between AGN luminosity andbroad-line region radius that underpins the indirect methods by which most AGNmasses are estimated. I also discuss how line widths are characterized in thismethod and illustrate how different ways of measuring the line-widths can leadto systematic errors in the mass scale. I discuss specific implications forNLS1 galaxies and consider whether the NLS1 phenomenon is better explained bysource inclination or by Eddington rate, and conclude that there is evidencethat both of these effects are contributing factors and that at least thehigh-Eddington rate NLS1s are physically similar to some high-luminosityquasars.

Masses of Black Holes in Active Galactic Nuclei: Implications for NLS1s