Free Listing v/s Paid Inclusion
Free listing refers to submission of a site into the directory for absolutely no charge. Paid inclusion means paying an amount for inclusion in the directory. Paid inclusion is now the norm when submitting commercial web sites, and all businesses should regard the costs associated with inclusion as an essential part of their yearly web site budget. Although many where critical of paid inclusion when the free submission model was, abandoned for being unsustainable. The contract that paid inclusion schemes offer (usually refereed to as 'Express Submissions') ensure all parties are clear about their responsibilities and commitments. This helps to reduce the abuse of search engines and directories as businesses are less willing to risk their site being barred or face legal prosecution as they attempt to abuse the submission process.
Free listings continue to be available to non-commercial sites and it is clear that in the future submissions will eventually fall into either the paid commercial or free non-commercial category.