As you haven't said otherwise, I'm assuming your computer has Mac OS X installed. :-)

My personal favourite is this program but whether it will suit you depends on what you want to do with your journal:

http://antennapedia.livejournal.com/266462.html

There's also:

http://hewgill.com/software/ljdump/

http://connectedflow.com/xjournal/

And I haven't tried it but I can't see any reason why this wouldn't work for OS X:

http://www.ljbook.com/faq.html

I hope that helps. :-)

Tip : you might want to wait a few days before your download your jounal because the servers tend to get very busy every time LJ make a dramatic news announcement.