Ozeki HTTP-SMS Gateway 1.0, and possibly earlier, stores usernames and passwords in plaintext in the HKLM\Software\Ozeki\SMSServer\CurrentVersion\Plugins\httpsmsgate registry key, which allows local users to obtain sensitive information.
http://www.vupen.com/english/advisories/2006/5093
http://www.securityfocus.com/bid/21679
http://secunia.com/advisories/23339
http://bb.domaindlx.com/bingung/shellcore/advisories.asp?bug_report=display&infamous_group=106