The Naked SEO Guide from Netpaths

Use the Google search engine to search for content that is minty fresh.

How often are you searching for a particular item using long tail keyword strings and find half of the results on the SERP are from 2002. Using the date parameter “&as_qdr=d” will filter results by date. Append this string to the end of a search query for a blogsearh like experience.

Google date search parameter: &as_qdr=d

You can change the value of as_qdr to custom intervals. A list of the possible values of the as_qdr search parameter:

• d[number] - past number of days (e.g.: d5)
• w[number] - past number of weeks
• y[number] - past number of years

See the date filtering search in action:
http://www.google.com/search?q=apple&as_qdr=d

TC has a writeup of this date filter and Matt Cutts and the GS blog explain what to expect for future google search operations.