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The OmniFocus iPhone manual is available here:

(Yes, it's a bit out of date, and we'd like to address that very soon.)

OmniFocus is primarily for projects and actions, not appointments. The Forecast view can show you your calendar events, but they still live primarily in the Calendar app. This is, as whpalmer4 mentioned above, guided by the GTD idea of separating the "hard landscape" calendar events from the "soft landscape" actions.