Links: The Americas

Dragonflies and Damselflies of Costa Rica: A Photographic guide but regrettably all of dead museum specimens, so it remains to be seen how usefull this might prove – hoping that I ever get to Costa Rica.
Dragonflies and Damselflies: Odonata of Monteverde, Costa Rica: This site, however, seems to be the root of the above link and appears to contain a host of useful information including better checclists with photos and a map of locations.
Dragonflies and Damselflies of Ecuador (Odonata): The same author also has this site on the odos of Ecuador, which might also make an interesting trip.