I just discovered The Nature Conservancy Group on Flickr.
They are having a digital photography contest on Flickr. They are looking for beautiful nature photography representing the diversity of life on Earth. Your own, original images of our lands, waters, plants, animals and people in nature are all eligible for the competition.
To enter the contest on Flickr, you need to join the group and then upload your photo(s) and send each image to The Nature Conservancy group. Tag each image for entry into one of the two categories -- "BestNature-TNC06" for your photographs taken anywhere around the world where nature has inspired you, or "Preserve-TNC06" for photos taken on a Conservancy nature preserve.
You need to upload your picture to the group by 11:59 pm Pacific Standard Time on Sunday, December 31, 2006. You must be a resident of the United States and 18 or over in order to participate in this contest.
The full rules can be found here and additional information can be found on their photo competition page.