I've read that it's possible to filter a highlighted block though a shell command, but I can't find out how. I typically want to sort an entire file into alphabetical order, which 'sort' will obviously do, but at the moment I resort to exiting Joe, sorting the file, re-editing. Tell me it's easier than that!
Damn. Seconds after posting the above I found the answer. Just in case anyone else comes looking: ^K/ is what you need.
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