UpTimeBot is a great site that lets you check your link popularity. It provides you with information from Google, Yahoo, MSN, Alltheweb, Alexa.
For example, from Google you can find:
Google Backward Links - Google doesn't show backward links from pages having PageRank value less than 3.
Google Mirror Site - Does Google consider yor site is a mirror of another site?
Google Indexed Pages - Quantity of pages from your site indexed by Google.
Google Contain URL - How many times your URL was mentioned?
You can check the link popularity for your blog or for a site you like:
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