so to revive an older thread for oww - here's the chicken seitan o greatness recipe:

Dry ingredients:
1 1/2c vital wheat gluten
1/4c nutritional yeast flakes
1t kosher salt
2t mustard powder
1/4t rosemary, dried
1/4t thyme, dried
1/2t sage, dried (NOT powdered)
1/4t white pepper (we actually used freshly ground black pepper; it's fine)

Wet ingredients:
2T fresh flat leaf parsley, minced very finely
1/2 fresh onion, minced very finely (I cut the half onion (papery skin removed of course) into chunks & ran it through a mini food processor for about 30 seconds)
4 cloves garlic, minced very finely (or run thru a garlic press)
1c + 2T water
2T olive oil
3T fresh lemon juice (from two or three fresh lemons)
2T course-grain dijon mustard (country style, I think)

Mix dry ingredients on one bowl, wet ingredients (including minced onion) in another bowl. Add wet ingredients to dry ingredients and mix until all the dry ingredients are incorporated into the dough. Form into a round "loaf" and wrap in tinfoil, twisting the ends firmly like a tootsie roll. Bake at 350*F for 1 hour. Let cool, then refrigerate for a couple of hours.

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My thoughts on this - I really liked it.  I don't think it does actually taste like chicken (not that I'd remember) but more like the things people often flavour chicken with (ie the herbs)
I was concerned about the mustard and lemon juice but you really can't tell in the final thing.  
I did use slightly less water as it just seemed too much compared to the original seitan o greatness recipe, but can't remember how much I reduced it by!