You can check a PageRank for a website using the Google Toolbar (represented by a horizontal blue and grey bar). This tool streamlines the process, enter a list of URLs and it will return the PageRank value for each one.

About PageRank: Google PageRank is a general representation of a website's popularity and is primarily based in link popularity. Website with a high PageRank value will tend to have more traffic and higher positions in search engines (although many other factors are also taken into consideration).