  The 4D Eigenvector 1 parameter space was introduced seven years ago as an
attempt at multiwavelength spectroscopic representation of quasars. It appears
to be the most effective diagnostic space for unifying the diversity of broad
line AGN. This progress report shows that the diagnostic power of 4DE1 is
confirmed using optical spectra from the SDSS, UV spectra from HST and X-ray
spectra from XMM. Our introduction of the population A-B concept continues to
provide useful insights into quasar diversity. Largely radio-quiet, high
accreting, low BH mass Pop. A sources (FWHM H_beta <= 4000 km/s) show strong
FeII emission, a soft X-ray excess and a CIV profile blueshift. Low accreting
large BH mass Pop. B quasars (FWHM H_beta > 4000 km/s) include most radio-loud
AGN and show weak FeII emission and little evidence for a soft X-ray excess or
a CIV blueshift.
