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
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.
Google for it !
Google on the Saint Pancras area in general.