Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 39 blocking script resources and 2 blocking CSS resources. This causes a delay in rendering your page.
None of the above-the-fold content on your page could be rendered without waiting for the following resources to load. Try to defer or asynchronously load blocking resources, or inline the critical portions of those resources directly in the HTML.

I tested my site in http://developers.google.com/speed/pagespeed and received this message, how can I fix this?