You can report url’s to Bing via http://help.bing.microsoft.com/#apex/18/en-US/10011/0 – It took a while to track that link down – hopefully they won’t change it again unlike the rest of the links I found.

Google’s report site is https://www.google.com/webmasters/tools/spamreportform?hl=en which is a much better url and one that doesn’t look like it will change much.