First of all the site says it no longer exists, so you can't see much about it. Others have had the same problem however, and I found this article that someone shows as a solution to your problem with hithavuzu.
http://www.google.com/support/forum/p/Google+Analytics/thread?tid=67444ac5f2db7aac&hl=enApparently somehow they are using your tracking ID, so it's not actually your traffic that you see on analytics. You can use a filter to prevent this from happening anymore according to that link.