As I was checking out the Smithsonian website, I stumbled upon an environmental education site called ShoutLearning.org. They emphasize cultural competency, global collaboration in an effort to take better care of the environment. Here’s two things I think this site does well: Get BADGES for attending and participating in CONFERENCE presentations!
Their site format features browsable conference presentations. As far as I know these are not only archived here, but they are offered live as well. If that is the case, that would be really cool!