Funimation is streaming a bunch of episodes from different series they own for free: http://www.funimation.com/f_index.cfm?page=videos

CrunchyRoll also streams official episodes, plus (for the time being) fan-subbed episodes of older, unlicensed series. They plan to delete all their fan uploaded stuff in january though, so that bites. http://www.crunchyroll.com/

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"Just think how stupid the average person is, and then realize that half of them are even stupider!"
--George Carlin