According to the Consumerist website:
Top 10 Worst Marketing Gaffes, Flops, and Disasters – Consumerist:
I’d also recommend these two FLOGs (fake blogs) in being not far behind.
Coke Zero Movement – read more here
Sony – All I want for Xmas is a PSP – read more here
Although I did like this badly named product as pointed out in one of the comments. LOL.