Dragonflies are neat. Excellent pics! Those don't look too giant compared to some I've seen.
Take a closer look at the size of the brick it's sitting on... it should give you a better idea of the scale involved :)
edit: Actually, I took these pictures with an Olympus Camedia C-50 - it's a very OLD make of digital camera. That alone should give you an idea of how huge these little guys were - I managed to image the entire vascular system of their wings with a piece of crap 5mp digicam I bought second hand, five years ago or so.