After my comments not so long ago about Echinacea, (Echinacea helps cold prevention, Echinacea helps cold prevention), and preparing to pump myself full over the coming months in an attempy to jump the gun and, hopefully, not get my usual winter cold/man flu, Ian sent me the following Google search for Echinacea, on which is links to 2 stories on the Beeb, one saying yes it does, and one saying no it doesn't.
Back in 2002, it seems the view was no, and a few years later, in 2007, a view that it does work. Confused? I'm off to get my dose of vitamins and Echinacea, not that it'll work, eh