Yahoo! SeriousYahoo! (http://www.yahoo.com) has been the biggest site on the 'Net for many years now. In the beginning it was considered important to get a listing in their directory.
A few years ago their service quality dropped and they started charging for commercial listings. When Yahoo! started using Google (http://www.google.com) to generate web search results, having an actual listing in Yahoo!'s directory seemed less important as long as your site was listed in Google.
These days a listing in Yahoo! is once again considered important, and there are three valid reasons why you should consider paying the $299 per year to have your site listed:
1. Yahoo! is still the most trafficked site on the Internet and your listing should generate noticeable traffic to your own site.
2. Since Yahoo! is considered one of the most important sites on the 'Net, a link from this site to your own site increases the importance of your site to other Search Engines.
3. Yahoo! recently purchased their own Search Engine so the partnership with Google may fall away in the future.