Google Websearch: Filter By Freshness

Is it me or is this a new feature? I was looking at the referers to this blog and saw this one.


The interesting thing is that there's a drop down to allow people to fine pages with certain degrees of freshness: 24hours, past week, past month, past two months etc.


And the results are actually effected by the filtering - has anyone else seen this? Or am I just blogging about something "old hat"?