There is a recipe for seitan that is making its way around the food blogs called Seitan O'Greatness, so I figured I had to give it a try as well.  I found what I think is the original at Post Punk Kitchen.
It is a little time consuming, but very easy to make.  The majority of the time is the 90 minutes it has to bake. 
Start by turning your oven on to 325.
You just want to combine the dry ingredients in a large bowl.  Combine the wet ingredients in a small bowl.  Mix each bowl well separately, then pour the wet into the dry and mix. 
Once it forms a dough, knead it for about a minute. 
Roll it into a cylinder about six to eight inches long.
Wrap it tightly in foil and twist the ends.  Bake this for 90 minutes.
Let it cool and then slice it as you use it. 
This can be used in pretty much any recipe where you want chunks of seitan, but is also tasty just sliced and eaten.
I haven't tried it, but many people seem to like it fried and a little hardened on the edges, and then mixed into their favorite recipe.
It has a little spice to it, but a tomato-ish flavor from the tomato paste.  So it's pretty good crumbled over pasta.

Ingredients:
1.5 cups vital wheat gluten
1/4 cup nutritional yeast
1 tsp salt
2 tsp paprika
1/4 tsp cinnamon
1/4 tsp cumin
1-2 tsp pepper (I use 2 tsp)
1/4 tsp cayenne pepper (you can use 1/8 tsp if you like it less spicy)
1/8 tsp allspice
2 tsp garlic powder


3/4 cups water
4 tbsp tomato paste
1 tbsp tamari
2 tbsp extra virgin olive oil
2 tbsp vegetarian Worcestershire sauce