Real time search is what everyone wants these days. Google does provide options using which you can restrict search results to web pages published within a specific time frame (like 24 hrs, a week, etc.). All you need to do is go to the advanced search options page to specify the date range. Doing this everytime you do a Google search is pesky and that’s when a Greasemonkey script comes handy.
You can add these date range options permanently to Google home page and search results pages using this Greasemonkey script for Firefox. It just does what it says.