My personal favourite is
Channel 101. Hundreds of 5 minute episodes of "tv shows" for free download, and some of the series which managed long runs are stone cold brilliant. Sci-fi (and other genre) parodies, music docudramas, musicals, melodrama, etc etc.
And most of them play on my C860 directly, especially the ones encoded in the last year or so. Bonus!
Be warned, there's significant amounts of profanity in a lot of them - even one (great!) show about a private investigator whose unfortunate last name is two swearwords joined together - but beyond that the content is generally not terribly offensive.
(Yacht Rock rocks!)