Quarkbase is a Free Tool to Check out most of its public stats at one single page. Its a Mashup of around 30 different data source which are grabbed and listed in a beautiful format with most of the data being real time information and linked with marketing related and traffic related websites like Alexa Traffic Ranks, Social Media Popularity etc.

Here is a list of features Quarkbase offers.
AmitBhawani.com at QuarkBase

Summary :
Traffic Rank
Famous in Countries
Blog Rank
Language
Delicious Bookmarks
Total Articles on Digg
Technology/Framework
Blogging Tool
Slogan/Tagline
Domain Whois Owner
Domain Registrar Details
Domain Registration & Expiration Dates

Social Popularity :
Links from Wikipedia
Digg Homepage Count
Comments on StumbleUpon
Links from Google Groups
Technorati Blog Rank
Technorati Blog Reactions
Pages on Reddit
Links from Yahoo Answers
Delicious Bookmarks Count

Top Feeds :
Blog Feeds + Subscribers Count + Graph

Traffic Rank Stats :
Alexa Traffic Graph
Top Countries Traffic Stats
Top Subdomains
Number of Pageviews

Technical Stats :
Lang/Framework
Webserver
Blogging tool
No. of DOM Elements
No. of iFrames
Hosting Service
IP Address
IP Location
Nameserver

Overall the tool is just awesome because it offers complete info like website Intro, website Popular, website Traffic, website People, website Spotlight, website Company etc. Just add your website name on the homepage the complete stats are offered to you instantly.