They are now in the process of implimenting RSS in LiveJournal. You can see mine at http://www.livejournal.com/users/gblake/rss if you'd like. Unfortunately, it currently only shows message headers. It looks like they are more interested in making LJ an aggregator though. Or at least that is what they are concentrating on right now.
I have kind of mixed feelings about this. While it's cool that they are finally supporting RSS, the way they are doing it feels kind of confusing. For instance, it looks like anyone can view your aggregator page, and even make comments on the posts there. So it would be like me republishing Scripting News with comment links.
