Some googling and testing revealed the following undocumented XML-RPC methods, which expose a number of nice functions from the client side.
All are in the LJ.XMLRPC namespace of course:
getfriendspage
sendmessage
setmessageread
getinbox
addcomments
These were gleaned from:
code.livejournal.org/trac/livejournal/browser/trunk/cgi-bin/ljprotocol.
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