This is very interesting! This can be an invaluable resource when people are looking for marketing solutions but are not specific about what they may need. Have you thought about adding Marketing Intelligence or Business Analytics? There are solutions that focus on helping marketing departments measure, correlate, and report on disparate data feeds from the channels (online and offline) used in campaigns. Understanding how channels affect one another and impact a campaign overall is key in maximizing resources to ensure positive ROI. The company I work for, Anametrix is one of them :)