Via GirlHacker I discover "The Truth About Splenda"- it's made with chlorine!
Wanna hear an even bigger scandal? Table salt is made with chlorine too. That's right. The food industry has been covering up the dark truth - salt is sodium chloride. Worse, unlike the Splenda molecule, the salt molecule ionizes easily, separating into sodium and cloride ions, both viciously reactive. Sodium in its pure form is explosive - we work with it in the lab (industrial uses!) And clorine is deadly.
This reminds me of the dihydrogen monoxide scare. (Everything on that website is true, and yet your government is doing nothing to protect you from DHMO.)
Similar scares about canola oil abound (refuted here) along with soy products, and all kinds of over-the-counter medicines.
And because I haven't linked to them yet, here are snopes and the alt.folklore.urban archive, which are worth a visit whenever something on the internet makes you scared of your food, or anything else that used to seem harmless.