But you can - it just takes knowing the silly tricks of Livejournal. You find that entry you want to refer to in your own blog -- and you'll see (unless the LJ user was being clever and has figured out how to add add one) no "Link here" link. You will, however, see a "Comment" link, and probably one that says "4 comments" or some variation thereon.
Either of those links will work as a "Link to this entry" URL. The "Comment" link will take the reader directly to a page that contains the full journal entry plus comment box. The "4 comments" link will take the user to the full journal entry, plus all comments left on it.
Like this: Tham talks about cliches and how we use them!
Thank you, and good night. ;-)