Useful Information Sites Webmaster World - Lots of great information and tips for professional webmasters. Main Search Engines & Directories Dmoz - Largest human-edited directory of websites also known as the Open Directory Project. Google UK - Currently the most important search engine in the world and with it's UK specific search fetcher makes it the most important search engine in the UK. Yahoo UK - Still a very important directory of UK websites. Main Pay Per Click Program Google Adwords - This is the main system for traffic on UK sites via Google. Microsoft AdCenter - For advertsing on the serach engine Bing. Website Friends Leonico - UK Affiliate Marketing company.