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Sam and I also developed fast and message efficient algorithms for reliable broadcast. Click here to download a postscript document describing our work.
Sam, Vassos, and I showed that it is impossible to solve the group membership problem in purely asynchronous systems (click here to find out more).
To get an overall picture of the state of research in the area of fault-tolerance in message passing distributed systems, have a look at "A Modular Approach to Fault-Tolerant Broadcasts and Related Problems" by Vassos Hadzilacos and Sam Toueg.