It seems that when I was a good web citizen and made all my pages nice and standards compliant via liberal use of DOCTYPE I apparently instructed IE to please ignore my CSS settings (come again?!  HTML 4.01 Transitional *should* understand the margin: auto construction).  I can fix it when I get home by changing the DOCTYPE into something else, unfortunately, the bloody page validators will complain unless I both fix the DOCTYPE into say XHTML 1.something *and* self-close all my meta and image tags.

Grr, grr, and grr…