I had a site that I wrote and built up from nothing to top 4 in the SERPs over a period of 4 months. Following the latest panda the site plummeted from 1000 daily visitors to 30. My query now is it worth building more sites? Or is the entire endeavour now finished? I'm not afraid of the work, I can happily write 10k words of decent content in a day but prior to relaunching I wonder what the general consensus is?