I will try to compile a list of the best directories in the coming days/weeks/months. I'm also looking for directory resources, if you have them or have a link to it post it here and I will try to see if I can add them. This is for directories only and currently two categories are up (at this moment) Suggest if you will. Free Directories - This means it's free to be listed, we're not talking about reciprocals or a long waiting time option, simply free directories. Paid Directories - This one pretty much sums it all up. If your directory is paid, then submit to this category. You may add some "fun tools" like the SEOmoz pagerank tool or the Alexa in the Descriptions field right after you include your sites descriptions. See example YOu may include an image or logo with your listing, 220 width if any larger than that the script will resize it to 220. Site requires no registration, but if you wish to edit or delete one of your listed site later, you'll need to have been registered to edit or delete those listings. Site is currently on auto approve see your site listed after you have submitted. Feel free to suggest or point to a resource that I may have missed, I will gather more infos and resources in the coming weekend, so expect a little more.
Are you going to consider a niche directory section? Even if put under free directories that are not general might not be the best fit. ie http://www.free-legal-directory.com/