Urban75's outstanding photo-article on St. Pancras: Midland Grand
Jon Hall's 1999 unofficial virtual tour of St. Pancras
Jim Redfern's potted history
Midland Grand Galleries by the Derelict Sensation
The glorious Saint Pancras Gallery by NursePayne on contaminationzone.com.
Joyce Whitchurch has a nice historical montage of St. Pancras.
The Public Lettering website on old and new passenger signs in Saint Pancras.
Great Buildings: St. Pancras Station
London and Continental Railways St. Pancras
Digital Archive of High Victorian Gothic architecture
If London WereVenice.
If the Victorians had had Neon lights ...
Google for it !
Google on the Saint Pancras area in general.