Google Page Rank
Google PageRank is just one of the Google measurements of how important a page is on the web. Google does not update the values often but it can be used as a measure of deciding a page's importance.
Current Value = PR 4
Alexa Rankings
Alexa’s Traffic Ranks are based on the traffic data provided by Alexa Toolbar users and data collected from other, diverse sources over a rolling 3 month period. Traffic Ranks are updated daily. A site’s ranking is based on a combined measure of Reach and Pageviews. Reach is determined by the number of unique Alexa users who visit a site on a given day. Pageviews are the total number of Alexa user URL requests for a site. However, multiple requests for the same URL on the same day by the same user are counted as a single Pageview. The site with the highest combination of users (Reach) and Pageviews is ranked #1. Additionally, Alexa employ data normalization to correct for biases that may occur in our data.