Mitch’s Wargaming site has a neat design for magnetic movement trays. I like the irregular shapes.
modeling
Dressing Up Your Tree Bases
The Wargames Table site has a tutorial on dressing up your tree bases
Casting Polymer Coins
This tutorial is on casting prop coins from polymer, but on a more miniature wargaming theme, I see this as a great way to cast casualty and morale markers.
Making Trees Cheaply
Mitch’s Wargaming blog has a tutorial on making cheap trees for your wargaming table. It looks like a lot of work, but if you have more time than money …
Modeling A British Colonial Blockhouse Fort
Here’s a tutorial for modeling a wooden blockhouse / fort.