There are a great number of sites out there which have many useful items for the Military modeller. Two areas spring to mind immediately, railways and for the diorama builder, buildings.

However, it can sometimes be a time-consuming business doing a series of searches on individual themes - better to have them under one 'virtual' roof... Such a site is this, which has literally hundreds of Railroad-Related themes all compiled:

RailServe Links Pages...

Thanks Jim! Wonderful!