I don't normally like to link to older content (read that in a sarcastic or sincere tone as you deem appropriate), but I'll make an exception here.
Dr. Ben Goldacre, columnist for The Guardian, has written a pretty devastating article on the scam called Homeopathy. As I - and most rational people - have always believed, homeopathy is to medicine what sacrificing goats on an altar to Baal is to veterinary science. Unfortunately most people still buy into the whole thing, not so much because they're gullible (though they usually are), but because they are not really aware of the flawed methodology and flat-out dishonesty that pervades the homeopathic "field".
Dr. Goldacre's paper is short, lucid and an engaging read that effectively decimates any argument in favour of homeopathy like an intellectual hammer to a pseudo-scientific ballsack.