This was on the bioware site. I think its just the manual description, but, here it is for your viewing pleasure:
"Operating in the border between light and darkness, shadowdancers are nimble artists of deception. They are mysterious and unknown, never completely trusted but always inducing wonder when met.
"Rogues, bards and monks make excellent shadowdancers, but fighters, barbarians, rangers and paladins also find that shadowdancer abilities allow them to strike at their opponents with surprise and skill. Wizard, sorcerer, cleric and druid shadowdancers employ the defensive capabilities inherent in the prestige class to allow them to cast their spells from safety and move away quickly. Despite their link with shadows and trickery, shadowdancers are as often good as evil. They may use their incredible abilities as they wish.
"Shadowdancers often work in troupes, never staying in one place too long. Some use their abilities to entertain. Others operate as thieves, using their abilities to infiltrate past defenses and dupe others. All shadowdancer troupes maintain an aura of mystery among the populace, who never know whether to think well or ill of them."
Edit: btw, thanks for modifying the topic