Savevid.com lets you download videos from streaming video sites. You can download videos from Youtube, Google Videos, Metacafe, Spike and more in FLV, AVI, MOV, MPG or WMV formats.
CommentPress is an open source theme for the WordPress blogging engine that allows readers to comment paragraph by paragraph in the margins of a text. Annotate, gloss, workshop, debate: with CommentPress you can do all of these things on a finer-grained level, turning a document into a conversation. It can be applied to a fixed document (paper/essay/book etc.) or to a running blog.