  The systematics of OB spectra are reviewed in the optical domain, dominated
by photospheric lines, and in the far ultraviolet (both IUE and FUSE ranges),
in which the stellar-wind profiles dominate. First, the two-dimensional
(temperature, luminosity) trends in normal spectra are surveyed. Then, the
normal reference frame having been established, various categories of peculiar
objects can be distinguished relative to it, which reveal several phenomena of
structural and/or evolutionary significance. Included are CNO anomalies at both
early and late O types, three varieties of rapid rotators, hot and cool Of/WN
transition objects, and the recently discovered second known magnetic O star.
The importance of both optical and UV observations to understand these
phenomena is emphasized; for instance, progress in understanding the structure
of the new O-type magnetic oblique rotator is hampered by the current lack of a
UV spectrograph. While progress in the physical interpretation of these trends
and anomalies has been and is being made, increased attention to modeling the
systematics would accelerate future progress in this author's opinion. Finally,
preliminary results from a Chandra high-resolution survey of OB X-ray spectra
(PI W. Waldron) are presented. They provide evidence that, just as emerged
earlier in the UV, systematic morphological trends exist in the X-ray domain
that are correlated with the optical spectral types, and hence the fundamental
stellar parameters, contrary to prevailing opinion.
