Alfred Wong has written a guide to weathering your plastic models. This is useful stuff — especially with the wide variety of resin and plasic vehicle models being used in games today.
Modeling
Making A Wargames Mat
This video from Red Beard Baron is a good tutorial on making a wargames mat from cloth, cauking and flock.
Making A Wattle and Daub Wall Wargaming Terrain
Here’s a photo tutorial on making a wall that simulates the wattle and daub building technique.
Early Crusader Period Flags
Here’s a selection of early crusader period flags.
Making WWI Airplanes From Clothespins
This post on making WWI aircraft from clothespins is not really a set of instructions, but the photos show clearly enough what has to be done. Brilliant bit of model making.