Seeing as there have been a few unknown dragonfly pics here...and now solved, I thought I'd see if anyone recognizes this species. I've seen them in two different areas and in both cases, they were doing the nasty...must be something in the air. I felt like a voyeur when I took the picture!
CLOSED: Another unknown dragonfly
Todd, That dragonfly pair looks like the Crimson-ringed Whiteface (Leucorrhinia glacialis) http://bugguide.net/node/view/18331
That's what I thought they were but mine don't have the white face that my guides show them to have. Based on your links, at least two pic don't show the white face either, so I guess there must be variation in whether the face is white or not. Thanks for confirming the ID!