There are hundreds of online SEO tools which check the data of a website and its popularity, but each of them differ in simplicity and ease of checking and usage. One of the best lately i have seen is popuri.us!
Popuri.us is a simple mashup that helps in finding website popularity, with no special rating given by itself but collecting all the data from the famous ranking sites like Alexa, Compete, Quantcast, Google etc. and displaying them instantly. Here is all the things that are checked by the mashup -
- Google PageRank – Current PR of the exact page submitted.
- Alexa Rank – 3-month average alexa rank
- Compete Rank – Compete rank of the main domain
- Quantcast Rank – Quantcast rank of the main domain
- Google BackLinks – Google backlinks count, to that particular page
- Yahoo BackLinks – yahoo backlinks count, to that particular page
- Live Search BackLinks – Live search backlinks count, to that particular page
- Technorati Links – Links from blogosphere, accd. to Technorati
- del.icio.us Bookmarks – Total number of bookmarks in delicious.com
- Bloglines subscribers – not always helpful, but still.
- WHOIS – Links to WHOIS data site
- DNS Report

Apart from this, you can place a light/dark widget in your website with the stats if you want to show them off. Also, while trying to fetch data for your website, try using both with/without the www in the domain name. Sometimes produces different results.
Check out the site at popuri.us!

hats off!!! i was looking for some same stuff. usually we need to open different web pages to make know about the real situation of site but this is really gonna work well but i want to ask is it sure the details it’s going to provide those are reliable because some times these kind of tools show some wrong details.
are there any sites that tell us link popularity in social bookmarking sites like social scan
I have not heard such site that tells link popularity on social bookmarking sites. It would be cool to have one.
Excellent one site where we can check all the rankings..
Thats good to know this site now it is made so easy to find all the rankings at one place.
The popularity of these sites can also be seen in the other sites but the information shared in these sites is a everything bought together at one place.