[babyBlueSedan]

Is there a way to filter out the albums you've heard that aren't in your collection? It would be nice to see, say, a list of the albums I've rated highest that I don't own.

If there isn't a way, I think it would be a good addition. A filter could be put either in the list of albums you've rated or the albums you've listened to only show the ones you don't own.
_________________
And it's hard to be a human being. And it's harder as anything else.

[albummaster]

The only way to do this at the moment would be to export both lists to CSV and put them side by side in a spreadsheet programme.

I'm doing some work in this area of the site for the next update, I can't promise this exact feature will be implemented, but I'll do my best to add it, and if not, it'll be in the update after.

[babyBlueSedan]

I didn't think of comparing CSVs, that might not be too hard. It will be nice to see it eventually but it's no rush, I know there are tons of updates planned, so any work on it will be appreciated.
_________________
And it's hard to be a human being. And it's harder as anything else.