More & better photo challenge setup
As the creator of the Weekly Challenge, I'm disappointed with the state it has been in for awhile now. A monthly challenge is too infrequent, and having behind the scenes judging defeats the entire purpose of a community. There is more than enough staff to go back to a weekly challenge setup.
If I could vote for a second, it would be EXIF data on pictures. Many of us use a browser extension to view EXIF data to help others, but it would be nice if that info were readily accessible by everyone for learning and teaching purposes.