When I went searching to find examples of people's swipe files, I discovered .
"A swipe file is simply a file or collection of marketing messages, headlines, techniques, etc. Essentially, whenever you see an example of great marketing you add it to your marketing collection." http://www.internet-marketing-tutor.com/swipe-file.html
As I have an interest in calligraphy, I always keep my eye out for an interesting font, an effective layout or text that could be used in a project.
My son took a marketing course last year. Leave a book lying around and I'll read it. I think the most useful tidbit I picked up was to not alienate the people who consistently support you when trying to appeal to a broader base". Good advice - don't forget who brought you to the party.