Filter Google Results by Date with a URL Trick

lifehacker.com — Add this "&as_qdr=d" to the end of a Google search to get a drop down box to show newer items first. Lets you choose past 24 hours, 1 week, 1 month, 2 months, 3 months, 6 months, or past year. You can also add this--javascript:window.location+="&as_qdr=d";--as a bookmark to automatically add the string to your search.