Directories
- Paid
- Free
- Niche

You will want to submit your sites to the various directories.

Your good/money sites can and probably should be submitted to at least a few of the paid directories.

Try to create some decent link bait/high quality pages for your tin/spammy sites, so that they can be submitted to some of the directories.

You don't need to submit every site to every directory, and you shouldn't. However, you should try to get as many of your sites a few dozen dozen directory links whenever possible. And try to mix up the lining footprint so that each of your sites isn't in the same directories.

Also, instead of just worrying about high PR (mistake), try to find some niche directories you can submit to.

To do this, get creative with your Google searches:
"keywords" + "add URL"
"keywords" + "add link"
"keywords" + "add site"
"keywords" + "add your site"
"keywords + directory"

Use broader, more general keywords for this...And just by changing keywords, you should be able to find a number of niche directories, assuming you have a semi-populr topic. This should help you find places to add your links that are relevant to your pages.

This is a pretty good program for finding general directories to submit your sites with:
Directory Submitter - Semi-automatic software will submit to 350 direcotries for free, upgrade to 2200 directories for $47.
http://directorysubmitter.imwishlist.com/download-free-b