Stun is nice when maxed, but I never bothered with any of the elemental damage bonuses. At low levels they have a small chance of kicking in, and by the time I could max them I didn't need the help. I avoided Deathblow because it shakes the screen.
With Augment Damage if your character is a male warrior, or you put 1 skill point in for the other characters, then save and load, you will have 2 skill points (same with Sword Expertise). I eventually maxed Augment Damage when I got to the wastelands, trying to use up most of my spare skill points.
If there are other skills you think would be more useful, then put the skill points there. If not, then investing in moderately handy skills is better than leaving too many spare skill points in reserve. Then again, you could try to see how few skills you can complete the game with. <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />
