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Essentially, Sarah, we are official volunteers who help with submitting cover images in the proper size, format, etc. to replace those unhappy blue "No Image Available" icons. If you like working with images, or just hate those blue icons, consider joining us.
There is information about both the image and data teams in this thread: http://www.paperbackswap.com/forum/topic.php?t=60867
You'll get a spiffy icon next to your avatar, and the requirements are flexible -- you can work as much or as little as you wish, and there are opportunites to work on special projects that may interest you.
Of course, any member can submit images for uploading -- they don't have to be a member of the team. But being on the team gives you better access to information about images, places to ask questions, etc.