A new ljKlient is out, mainly because I couldn’t be arsed to add more windows and protocol support yet (as would be needed for adding and deleting friends), so instead I fixed minor bugs and made the list look a bit nicer, and added a revolutionary feature to the friend list: you can drag a friend and drop them anywhere in the editor field, and you’ll get the <lj user="username"> thing inserted right there.
As always, you can get the newest from the project download page at http://sourceforge.net/project/showfile