A browser-based crossposter would certainly be possible, although at that point I'd take it a step further and also have it archive my posts locally as well.
Even better would be writing locally or on a server I control and having it sync out to both sites, because I just don't trust these services not to disappear. It sounds like maybe that's what you're suggesting with your last paragraph there. For now I'm just considering writing Yet Another LJ/DW Archiver script, though...
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A browser-based crossposter would certainly be possible, although at that point I'd take it a step further and also have it archive my posts locally as well.
Even better would be writing locally or on a server I control and having it sync out to both sites, because I just don't trust these services not to disappear. It sounds like maybe that's what you're suggesting with your last paragraph there. For now I'm just considering writing Yet Another LJ/DW Archiver script, though...