AFAIK, there's no Linux client that offers cross-posting functionality. (I am thisclose to learning C just so I can make one...) One person suggested to me the idea of posting to DW though LogJam, then loading the last entry back into LogJam and posting to LJ/IJ/DJ/whatever. I haven't tried it yet, though.
DW has plans for a built-in cross-poster. I'm looking forward to checking that out.
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DW has plans for a built-in cross-poster. I'm looking forward to checking that out.