Carmen’s Fun Painty Time blog has a tutorial on making swords from wire.
Carmen’s blog has a set of instructions on making bits of rubble from Sculpty.
The OMad blog has an article on converting Lord of the Rings plastic figures. Learning techniques such as these will come in handy, given the large number of plastic figures now in the offing.
Toposolitario has a tutorial on making a futuristic bunker out of spare miniatures bases.
The Tabletop Terrain site has a little, but useful article on making movement trays for your figures. This is particularly useful for games like Warhammer Ancients and the new Lord of the Rings big battle game, where large numbers of individual figures are maneuvered about.