The following 4 photos are all of immature females. I don't think too much should be read into this as I saw males, but just didn't get any good photos. It would make sense they aren't mature since it's early in the season.
Eastern Forktail - immature female. Probably our most common damselfly and highly variable in colour. Imm. female features: orange in colour, black shoulder stripe, dark abdomen that lacks any blue or orange on last segments. These were at a boggy area at Turkey Point, May 23/2012.
Fragile Forktail - immature females. Fairly common; look for the broken pale shoulder stripe.
Top one from Turkey Point, May 23/2012. Bottom one from Long Point Provincial Park
Skimming Bluet - male. Common bluet found in a variety of wetland habitats. This is a "black-type" bluet meaning that its abdomen is predominantly dark. Abdominal segments 8 and 9 are blue, and segment 2 has a unique, wavy blue marking. Turkey Point May 23/2012.
The following photos are all unidentified bluets belonging to the "mostly-blue" group of bluets. They are either Familiar Bluet, Hagen's Bluet, or Marsh Bluet. For identification, one needs to use a hand lens on males, or a microscope for the females. I did not go to those lengths this week. I suspect they are Marsh Bluets, but I can't be certain. All were photographed at L.P.P.P on May 22/2012.
Males above, females below.