Dataopedia: All In One Website Statistics Web Service
Dataopedia is a search engine and website statistics tool that can be used to get all in one traffic and popularity overview for any given website.

To get started, simply key-in the website name and hit search button. On a single page, Dataopedia will show website’s traffic stats, website popularity among social bookmarking and social networking sites, ongoing online discussion about the site on twitter and friendfeed, technical data like the registrant info, company data and its office locations.

Instead of viewing all stats on a single page, you have the option to see individual statistics. Click the corresponding tabs on top of the page.
Features:
- All in one website statistics data service.
- Easy to use and free.
- No sign up required to view the data.
- Shows traffic stats from major analytics networks like Alexa, Compete and Quantcast
- Shows country wise traffic.
- Shows sub-domain wise traffic.
- Shows website popularity on social media and other popular sites.
- Shows ongoing discussions about a website on twitter and friendfeed.
- Shows registrant information and company data (if available).
- Similar sites: AbouThiSite and AboutUS.
Check out Dataopedia @ www.dataopedia.com (by ROW from www.reviewofweb.com)



http://www.estimix.com is another useful estimator for the value of each website. It seems to provide much better traffic information and competitive analysis for free.