Concentrated seems like it would be good as well. I think these options would be especially good for an artificer or somebody heading into Alchemist Savant, since both will be picking up Brew Potion anyhow. Very nice find indeed, bearsarebrown
Once I get around to adding some more poisons I found in other obscure books (none of them particularly good though), I'll put this into the main part of the guide as well.
Oh, I also got a PM from zagan with another cool suggestion that adds a little more kick to every poisoning attempt:
It's a special material for weapon from the arms and equipement guide:
Gehennan Morghuth iron:
The weapon gain a -1 penality to attack and damage roll.
If it's piercing or slashing for each succesfull attack the weapon deliver a poison,
DC 12 1 Dex initiale 1d4 Dex secondary. It cost 4000gp.