Thread: online manual?
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Instead of posting "+1" or "me too", send in your request to omnigraffle-ipad@omnigroup.com or use the Send Feedback feature.

The response I got about a month ago when I did so was that they intend to post the documentation online, but want to do it at such a point that it won't be immediately out of date. Still, if there are enough requests, perhaps it will be posted sooner. It appears to just be a set of HTML pages, so I'm not sure why it can't be posted with relatively little effort. They did have the original iPhone OmniFocus app's internal help on the web at one point.