Check websites for Google Page Rank, Alexa Rank,
DMOZ & Yahoo Directory Listings, Backlinks, Domain Age

Easy Install Page Rank Script for Webmasters

If you do not have enough PHP experience to download and install the pagerank script of your own, you can also add some simply code to your website and have a box for your users to check the pagerank of any website they like.

Simply go here to get your code.
Just copy / paste it into your webpage and you are done.