While a few pools do this, I'm not comfortable with it. There is no namecoin exchange that offers an API to execute trades, so all I can do is poll the last prices whenever somebody wants to do an exchange, then pray that rate doesn't change to much by the time I sell them. It could cost me money to do that with how many people mine at BTC Guild if the price swings too much between selling batches of NMC. It may not happen *as* much these days, but that market can get very volatile when somebody decides to screw around with it.
well u just always give a little less than exchange price