Move your entire livejournal
http://liz-marcs.livejournal.com/275028.html
You can transfer everything including comments (with the exception of some embedded content and polls) to your own hard disk - this is fast and easy, and all of the original posts (but not comments, embedded stuff, or polls) to another blogging site - which works but goes slowly and is a bit of a pain.
So if I'm all over your friends list on Greatestjournal today that's why...
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LJ Book notes that they will need your password to do so, and recommends changing it before you use it, then changing it back afterwards. I've used it, and it's great.