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You can email documents from OmniGraffle for iPad, and as I understand when the iPad is plugged in to your desktop iTunes has a "Documents" area for transferring files.

As for trial versions go, I'll quote Brian from another thread:

"We are huge fans of "try before you buy". OmniFocus for iPhone is currently installed on Apple Store demo units; we'd like to do the same with these apps if Apple is interested."
"Vroom! Vroom!!"