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Super un-optimized, but very convenient. The biggest thing is that it shows a unified view of the outputs from different hosts and allows you to drill into where they differ. It has other niceties, like running the sessions in tmux so you can interact, etc. writeup at skife.org/b4/bdsh/

Looks interesting, but a couple of ideas come to mind. One would be to enable sending commands to all hosts while in interactive mode (that's usually how I've used cluster shells in the past) and the other is to allow per host log files which could be handy for collecting compliance data.

I like the broadcast interaction idea! Per host logs are already there. It sets up a directory per host, generates a script which actually executes things, and captures output and run metadata in it. You can specify to keep that stuff when it finishes, instead of the default delete-on-completion