The article "Dan Janal's guide to marketing on the Internet" provides a comprehensive guide for creating a successful Internet marketing plan. It covers topics such as conducting online research, measuring Internet investment, using the Internet for customer support, and writing effective publicity material. The book includes real-world examples of companies profiting from online marketing and sales efforts. It also discusses new online marketing strategies like affiliate programs and selling strategies for different types of businesses. The author, Dan Janal, is an experienced marketing expert and the founder of an online marketing agency.