Directory Advertising

If you Google "online directory" you get nearly 8 million search results. Below are the top five.

1. Residential Numbers - The Phone Book from BT

   The Phone Book. Improved search functionality and site layout ... more · Business type | Business name |. Residential name. | International codes | UK codes ...
   www.bt.com/directory-enquiries/dq_home.jsp 

2. Search for People, Businesses and Places - 192.com

   Find people, businesses and places in the UK with 192.com. Directory enquiries, a people finder, business listings and detailed maps with aerial photos.
   Business - 118 119 - Search All - Maps & Travel
   www.192.com/

3. UK Directory - the largest online directory of reviewed sites in ..

   Have a great web site then have it reviewed and get it on UK Directory or tell the world what your site is about with an exclusive directory page dedicated ...
   www.ukdirectory.co.uk/ 

4. Yell.com the UK`s local search engine - search for United Kingdom ...

   Yell.com is United Kingdom`s local search engine, providing access to classified business information, including business websites, addresses, phone numbers ...
   www.yell.com/

5. Search for a UK business with the ThomsonLocal.com directory.

   Thomsonlocal.com the only online directory that gives you Nectar points. login | register · add free listing · advertise with us · leave feedback ...
   www.thomsonlocal.com/

These directories can provide great leads but it really depends on what kind of business you have.  Emotio can help you pick the best directory for you.  There are also thousands of specialist directories for niche industies.  Directory submissions can also play and part in an effective link building campaign.