David Neat, author of Model-Making: Materials and Methods, has a blog going with all sorts of model making techniques. Posts on painting, mold-making, working in scale, and more are described and shown with ample photographs.
I really like this illustrated chart of hand tools over at Popular Mechanics. The chart itself is good-looking enough to hang up in your shop, while the tools pictured on it give you a great idea of what your shop is missing.
Smooth-On has a ton of great videos over at their website showing how to mold and cast with many of their materials. If you haven’t checked them out yet, start with one of their newer ones on how to make a mold for a replica of an antique rifle.
If you ever wanted to take the time to make chain mail by hand (as opposed to just spray-painting some crocheted yarn), Make Projects has a great tutorial on just that.