One thing I frequently do in OmniFocus is to add an action group, that is a task with a series of sub tasks. Action groups are flexible because they can be turned into projects if necessary, or be a series of tasks within a project.

The Workflow works by asking you for the main task, then it asks for the sub tasks. Each sub task is indented (and has a dash added in front of the name to make it TaskPaper friendly), and then the whole lot is put into my OmniFocus inbox.

Exact Workflow Steps:

You can get the workflow here: Add Task & Sub Tasks To OmniFocus.