Syncing my LJ with Foo BlogSite
I've seen a couple people (example) asking whether they can synchronize their LiveJournal with their [insert other blog site] account (Blogger, MySpace, etc.) museumfreak brought it up as well.
The requests tend to end up in Syndication, but I think some of the external web clients might be able to help too.
In any case, I think this issue could use a FAQ of its own or a section in an existing FAQ.