I wish I had asked this very question before I brewed my oatmeal stout. I actually just opened the first bottle about 10 minutes ago! I did almost no research on the recipe, but ended up steeping 2lb of crushed flaked oats in with the other specialty grains. It ended up just making a big bag of oatmeal and not really giving the flavor/feel I was anticipating.
I'll try these techniques with the next batch though because experimenting is half the fun, right?
In the mean time, cheers!