Do the directories get the PR from majorly reciprocal links or what kind of link building can a directory do? Does one submit directories to directories as well? Article submissions and all are also out of the question.. How does some directories have very good PR?
Don't bother with reciprical links or link exchanges. Get good one-way links point to your site. Directory submissions and article submissions work for this. Also, spend some money purchasing links.
Directory is Site,too. Just do the same with what you do with your other sites.(submit to dirs,buy links on high pr sites,ect.)
Buy paid links, submit to free directories, write articles and submit to article directories, annonce it to various forums (here is one list), suggest to various directory list etc...
You should submit directory to list of directories, submit into other directories and purchase links from high PR directories.
Im a big fan of FREE things, are there any free sites with automatic submissions to a bunch of directories? ive used submit express but thats pretty much it
Manual is the key automate submission software are crap Olso for a pr for a directory same strategys like any other site Good Luck