If you want to help out with the database improvement/completion, check this links:
band you know with no profile (you can submit a profile by clickin on "[Edit profile]" on the artist page)
album you own without cover art (there's an uploading cover art link on the bottom of the release page)
album you own with no tracklist & or no label (there's a correcting data link on the bottom of the release page)

My submissions in queue.