I must sing the praises of JournalPress, a WordPress plugin that not only crossposts to LJ, it lets you crosspost to multiple LJ-type sites at once. So I’ve got it set up to dump posts out to both LJ and my JF account. Works like a charm.
If you’ve got a need to crosspost to multiple LJ-style sites off of WordPress, you might check the plugin out. And if you do, be sure to thank the author for her hard work!