Happy to help! The answer kind of depends on what you mean by a "Due Today" perspective, but if you're just looking to see a list of the items that have a deadline in the next 24 hours, the following steps should help:
- Open OmniFocus' preferences, from the OmniFocus menu.
- Switch to the "Data" tab.
- Set the "Due Soon is in the next" preference to "24 hours".
- Close OmniFocus' preferences.
Does the "Due" toolbar button show you what you're looking for at this point? If not, let us know what else you'd like to see and we can help.