Physical media gets noticed. Handing somebody a brochure is far more effective than any banner ad. Even though many pamphlets end up pockets, they are often found later, and generate sales. An image on a computer screen is often forgotten; a brochure stays longer, and may generate sales on the third or fourth view.
Brochures give the reader more information that the poster, but not the entire range of products and services like the catalogue. They are great for letting people know that your company is there, encouraging people to remember you when your services are needed.