Here is a list of some directory lists and resources:

• Strongest Directories - A directory listed sorted by Page Strength by Seomoz.org's tool.
• Info.Vilesilencer.com - Offers a free and paid SEO Friendly Directory List with a downloadable excel spreadsheet.
• Directory Critic - Offers free, paid, article, niche, and reciprocal directory list. Includes features as "Rate my Directory" and advertising for directory owners.
• SEOCompany.ca - Contains Free, Paid, Niche, and Multi-Link Directory lists.
• Best Web Directories - Offers very large list of free, paid, and deep link directory lists.
• Smashing Web Directory List - A very large list that can be sorted by pr, backlinks, and more.
• AddURL.nu - A large selection of free directories. Updated often.
• Bid for Position strongest list - a list of bid for position directories sorted by page strength
• DirTen - a directory showcase sites, lists all directories with great design.
• Paid Directory List - list of paid directories, sortable. Listings categorized by PageRank.
• The Best Directories - a large list of directories with useful owner information.
• Forplex Directory Owner Index - a list of directories with owner information.
• Koopy.org - a list of free, paid, reciprocal, and niche directories.
• Web Directory List - a list of web directories and directory resources sorted by contribution amount and organized into categories.

If there are any other great directory list resources, please list them here.