We describe how recent X-ray surveys have led to advances in the under
standing of ultrasoft narrow-line Seyfert 1 galaxies. The number of kn
own ultrasoft narrow-line Seyfert Is has increased greatly in recent y
ears due to X-ray surveys, and it is now possible to obtain high quali
ty 0.1-10 keV spectral and variability measurements for a large number
of these galaxies. We generalize some of the correlations between X-r
ay properties and optical emission line properties, focusing on how th
e ROSAT band spectral slope appears to be directly connected to the Bo
roson & Green (1992) primary eigenvector. We discuss how ultrasoft nar
row-line Seyfert Is may well have extremal values of a primary physica
l parameter, and we describe new projects that should further improve
our understanding of these extreme representatives of Seyfert activity
.