I've written an access control circumvention device for *N*X: http://i.yak.net/twiki/bin/view/Fnord/ChDMCA
I wrote it after reading Unintended Consequences: Three Years under the DMCA
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!