The example format for RSS feeds from LJ code sites is given as
http://www.livejournal.com/users/exampleusername/rss/
but that has now changed to http://www.livejournal.com/users/exampleusername/data/rss/
The change has been current for a while now, so I would expect most daughter sites to have switched. The one that's in the FAQ does forward to the correct one, but is deprecated.
