I heard that the ingredient sodium laureth sulfate, commonly found in hair products, causes cancer. Is this true?

Since 1998, there has been a well-circulated e-mail that warned that there was a link between cancer and sodium laureth (or lauryl) sulfate (SLS). Upon further investigation, the e-mail was found to be a hoax. In Health Canada's look into the matter, they have stated that SLS is safe for use in cosmetics. Other sites, like about.com have extensively written the e-mail, in the catagory of Rumour and Urban Legend.