Quarkbase is an free online service which gives you complete information of any website. It is a mashup of over 30 data sources and many algorithms gathering information from Internet on various topics like social popularity, traffic, associated people, etc. All you need is to enter the URL of the website and it populates complete information available regarding the website.
Quarkbase gives information in various tabs like intro, popular, traffic, people, spotlight and company information. It gives lots of useful information on social media, like how many links are available in Delicious, Digg, Wiki, Stumble, Technorati etc.
It also provides information on feeds and number of subscribers. In traffic section it gives the traffic details like page views, top countries popular and Alexa rank. Apart from this it also gives hosting, IP address, IP location and nameservers.
Quarkbase is a good website which gives handy information in a well arranged format. There is also a summary page which gives some quick information on the website.