Economics Search Engine

 http://ese.rfe.org

From the webside:

ESE uses a beta version of Google Custom Search Engine to search over 23,000 economics websites
and utilizes yolink to mine results and retrieve actionable, keyword-rich content. Results can saved to Google Docs, bookmarked or shared via major social networks. Each site is certified by RFE, which is run by economists from RePec Author Services and EDIRC.