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...page 138 in the revised edition of WORD OF MOUTH MARKETING by Andy Sernovitz.
"Never under estimate the power of swag-free hats, shirts, bag, toys or anything with company logos on it." There are several paragraphs speaking to this point. "Every item with your logo becomes a word of mouth generator when it's worn by a real person." His point concludes with "Give away lots of free stuff."
I highly recommend this book along with Andy's blog www.damniwish.com and his website www.wordofmouthbook.com .