What a pleasure to find your site after searching through minute pictures that have no details. Here are two that I would love to have IDed. (Actually, now that I look at them closely, they are probably the same dragonfly).
We don’t recognize this beauty and sadly, haven’t the time to research right now. Try www.bugguide.net and if you find something, please write back.
Ed. Note: We started to feel like slackers, so we searched. We think, possibly, this is a female Blue Dasher, Pachydiplax longipennis.