I had performed steps as described here , 24 hours passed but Analytics site still shows "Tracking Not Installed" status. Ideas?
Apparently, It started working. It seems my mistake was in setting site url as the full path, but it was necessary to set site url to "sites.google.com" part only.
The last answer by Gombessa on this page should solve your problem: http://www.google.com/support/forum/p/Google%20Analytics/thread?tid=49d5b624719688b8&hl=en