kjenks said:3.5e shurikens are a bit different. They can be drawn as a free action and used as a monk weapon for Flurry of Blows.
My 14th level character with 24 Str, Boots of Speed, two levels of monk (Flurry -2/-2) and two levels of ranger (two-weapon fighting) could theoretically hurl six of these per round, with 1d2+7 damage (and 1d2+3 for the one hurled with his off-hand attack). But he never does; there are better ways of dealing damage.
shuriken don't add strength to damage. they are too light.
As far as throwing a whole lot go... flurry, rapid shot, improved two weapon fighting, the palm throw from the master thrower... you could get a whole lot up there. Really though, the only good way to use them is poison.