Darren's $5 Script Archive osDate 1.1.7 and earlier allows users to boost their own ratings via a txtrating parameter with a score greater than the intended maximum of 10.
http://www.securityfocus.com/archive/1/443198/100/200/threaded
http://www.securityfocus.com/archive/1/440592/100/0/threaded
http://www.securityfocus.com/archive/1/440490/100/0/threaded