Skill Opinions: Overall, you do not need to use that many skill points as a swordsman (Dream of Mirror Gold) nyaa. Taking 1 - 2 attacks, and lash out is easily enough to get you past level 30 with no real hassles.
Personally, we would take Growling Tiger and Maniac Attack. Berserk Blow may seem better than Maniac, but given high weapon durability, and the fact maniac does 2x the damage of Berserk, it is not quite as high on our list. Of course, with ready access to healing, Berserk may be better for some people.
Lash out is one of the better Swordsman skills we think nyaa. Only one level (Dream of Mirror Online Gold) is really needed for full effect as well. While getting five levels for sneak attack and reduced penalty sounds nice, sneak attack really isn't great without large-scale PvP, and the penalty reduction is not so great.
Lash out itself however, is possibly the best sub-skill you can take from the swordsman tree, as it stacks with other attack speed enhancing buffs. Using the thief skill premonition and lash out, you have an attack speed of almost nine. Burning rage we found to be good prior to level 25, after which it was a skill we hardly used.