
Using a redirector to track outbound clicks to other websites is quite common. All too often the destination site of the redirector can be changed to an arbitrary site, which may be used by spammers or phishers to cloak their link in apparent legitimacy.
An Open Letter To Redirection Sites - www.surbl.org/redirect.html
Open redirectors as a tool for scammers - www.lindqvist.com/en/open-redirectors-as-a-tool-for-scammers
Is your web site an open relay? - blogs.msdn.com/oldnewthing/archive/2004/05/12/130454.aspx
CERT: Vulnerability in web redirectors - seclists.org/fulldisclosure/2003/Mar/0200.html
Anti-Fraud Open Redirect Detection Service - news.netcraft.com/archives/2005/05/12/antifraud_open_redirect_detection_service.html
The impact of Open Redirects to Malicious Websites - blog.hautesecure.com/archive/2007/07/13/the-impact-of-open-redirects-to-malicious-websites.aspx
Redirection Abuses (live.com problems) - redirectionabuses.spaces.live.com/