The title is not entirely accurate. What Google has introduced is a way for you to get the times of sunset and sunrise wherever you live.
I am at the moment in Hazleton PA and my query told me that sunrise tomorrow (June 29th 2010 ) is at 5.34 a.m and that was 6 hours and 6 minutes away ( Time to sleep I think) I found this announcement on the Google forum and in course of my research also discovered that Google has a Facebook page with over 1.6 Million fans ( “Likers” ) This will be useful for people who rise with the sun and for those who practice http://en.wikipedia.org/wiki/Surya_Namaskara
Sarah the Google employee in the Google Web Search forum also said “Another fun one to try out is [sunset atqasuk alaska], where the next sunset won't be for 37 more days." When I tried that today the sun will not set their for another 31 days – cool !