A Historical Note on `Geometry and Concurrency': Online report by Eric Goubault, surveying the field from its prehistory in terms of classical interleaving and non-interleaving analyses of concurrency, through to modern applications of simplicial sets to fault tolerant computation.
Algebraic Topology and Concurrency: Reports applying methods in algebraic topology to concurrent computation. Maintained by Stefan Sokolowski.
Algebraic Topology and Distributed Computing: Powerpoint tutorials by Maurice Herlihy at Brown University.
Scientific American: Computers without Clocks: Asynchronous chips improve computer performance by Ivan E. Sutherland and Jo Ebergen
The Part-Time Parliament: Technical report by Leslie Lamport characterising a reliability issue in distributed networks in terms of a fictional parliament's consitution.