http://www.yellowpages.com
2. Zip2 Yellow Pages
http://www.zip2.com
3. GTE Interactive Yellow Pages
http://www.gte.net
4. SuperPages
http://www.superpages.com
5. Respond.com
http://www.respond.com
6. Switchboard
http://www.switchboard.com
7. BigBook
http://www.bigbook.com
8. At Hand
http://www.athand.com
9. US West Dex Yellow Pages
http://www.uswest.com
10. Bell South Real Pages
http://www.realpages.com