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United States Postal Service
As an independent agency of the government, the United States Postal Service homepage offers information on zip codes, address change, stamps, online billing, and variety of other topics.
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Creating Brochures That Sell
Quick review of purposes of company brochures, includes styles, copyediting, and other considerations in their production.
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Myprofessionaladvertising.com: Print Ad Strategies
This site comes from the 2nd chapter of a book by Professional Advertising which lists 36 ways in which your ads will be more profitable. This site provides very useful examples of each of these 36 ways.
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Copywriting Tutorial: Identifying Your Usp (Unique Selling Point)
Every successful ad has a unique selling point even if you don't think there is one. Tips on how to determine/create USP for any product or service. Very readable & puts viewpoint across in interesting & memorable manner.