How basic? Very. It can log in, check for friends posts, load text files and make public posts. For the moment, that's it. Quick way of posting entries written in your favourite editor though.
If anyone's curious it will be included in the downloadable code from http://www.phase.org/ in the next release (to follow shortly). Core script is gtk/ljclient.php
The code runs on GTK-PHP, available at http://gtk.php.net/ .
svn-25 svn-26 contains the current code.