In the Blekko search engine you can get the search results in JSON format, e.g. with the search term 'lifehacker':
http://blekko.com/ws/?q=lifehacker+%2Fjson
How could you carry out this query from R and parse the content? [There is a URL, a RSS URL and a snippet with the main text.]
I have tried packages tm.plugin.webmining and boilerpipeR, but couldn't figure it out.