It's very common for business presentations or projects to require sequence diagrams. Commonly, people try to use Visio if it's available in their organization, though this may often be overkill. Also, some people try to hack some basic sequence diagrams together with PowerPoint, leaving much to be desired. It would be beneficial to have a program that does information visualisation well!
Sequence Diagram Editor is a decent looking piece of software for creating UML-based sequence diagrams and call flows. It is able to automatically generate complex layouts and formatting, much faster than many other expensive UML tools.