I should check this forum more often. heh.
There is a very easy way to make seitan at home. All you need is wheat gluten flour (sold in bulk at health food stores, or in a box by the other flours. You can also find it at well stocked supermarkets), water, and whatever spices you'd like.
Measure 1 cup of gluten flour into a bowl. Add whatever spices you'd like (for Mexican seasoned seitan, I put 1 Tbsp chili powder, 1 tsp cumin, 1/2 tsp each onion and garlic powder) and mix. Add 1/2 cup of water and mix well. You'll probably have to start using your hands after a while. If it seems like you don't have enough water, add more about a tablespoon or two at a time. Knead the ball for a little while (you can do this right in the bowl). After that's done, break off pieces of the dough, roll it into snakes that are thinner than you want the finished product to be, and cut it into chunks. Boil in water (or vegetable broth, for added flavor) for 30 to 60 minutes.
And now it's ready to use in your favorite recipe. (DH loves seitan fajitas.
The longer you knead it, and the longer you boil it, the "tougher" it will be. So with a bit of practice you can control how tender you'd like it.