We use the Plan 9 from Bell Labs operating system in several applications, as our preferred internal source control/archive, and for managing data from race shop and onboard embedded systems. We're collecting Plan 9 material here…slowly.
Right now, a mirror of videos of the talks at the 2nd International Workshop on Plan 9 (2007, hosted at Bell Labs, Murray Hill, New Jersey, USA). They were recorded and produced by Andrey Mirtchovski and Latchesar Ionkov at 9grid.net.
The ported markdown filter used to process these documents on Plan 9 has been absorbed back upstream into Parsons's Discount tools and C library for converting Markdown documents to [X]HTML.