Comparing May 2012 (month before launch) with June (month of launch) the following stats tell the story best:
Visits up 127%
Page views up 482%
Pages per visit up 155% (to 5.5 pages per!)
Site referrals up 497%
Search referrals up 65%
Time on site up 72% (to 4:20)
Bounce rate down 94% (to 1%!)
Our site bounce rate is down to 1 percent! This means that just about everyone who hits our site finds another page of interest. Crazy stats!

So if you’re thinking about whether fresh content can make a difference in your site experience, our answer would be ‘HECK YA!’. Our advice would be to integrate that content into your site, Today!Google continues its push and focus on fresh, original content with the latest Panda updates rolling out starting tonight. Below is the most recent tweet from @Google.