In the early 90’s, many CD ROM publishers did very well. The Bureau of Electronic Publishing had a catalog with thousands of popular titles.
In the late 90’s, content migrated to the web. “Content is King” was the theme of many internet conferences. Many content companies did very well–some with advertising business models, some with ecommerce, and some with subscription business models.
In the future, the same content that drove CD ROM sales and mass adoption of the internet will migrate to cell phones and other portable devices.
As an information entrepreneur, I often go back to my 1992 Updata CD ROM catalog or my old Bureau of Electronic Publishing catalogs to see what was popular in the early days of CD ROM. I also visit the BYU library to use the reference books that tell me about the most popular databases from commercial and government sources.
Before building a mobile content business, collect these old catalogs and reference books and see what you can learn from the earlier CD ROM and Internet content providers.