5v on 3.3 pro mini?
The example on build site shows 5v to a 5v arduino pro mini with a 5->3.3v converter to radio.
Is there any danger or things to think about if you have a 5v power supply going direct trough a 5->3.3v converter to a 3.3 arduino + radio.
None that I can think of. There is a 3.3v converter on the pro-mini which you can use (when you power from the "raw" connection. Make sure you add a capacitor on the radio power lines.
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The raw connector can handle about 3.3-12v (or 5-12v for a 5v arduino), so 5V should be fine. If you have a wall plug that should give "12V", it might give a whole lot more under low loads (such as a measly arduino) - I've burnt more than one regulator with that.