  Several X-ray properties of active galactic nuclei depend, or appear to
depend, on their luminosity. It has long been suggested that alpha o-x, the
X-ray ``loudness'' decreases with luminosity. There never has been a
satisfactory explanation of this observational claim, and the statistical
soundness of the result has been disputed. The earliest systematic studies of
the X-ray variability of AGN showed that these properties also depend on
luminosity. In particular, the normalization of the power spectrum, or
alternatively the the variability amplitude, are anti-correlated with
luminosity. Most recently, tentative evidence from Ginga for an X-ray Baldwin
effect - a decrease in the iron K-alpha equivalent width with luminosity - has
been confirmed and extended by ASCA. The new data show that the reduction in
strength is accompanied by changes in profile. These results will be described
and their interpretation discussed.
