Here's One Solution

I'll keep adding more when I find them:

http://www.movable-type.co.uk/scripts/itunes-albumlist.html

Edit:

This looks really easy:



Copy whole iTunes listing.
Paste into OpenOffice Spreadsheet.
Delete all columns except Artist and Album.
Go to Data > Filter > Standard Filter.
Click 'More >>' button.
Tick 'No duplication'.

So basically just get rid of the columns you don't need and then copy it over to excel and get rid of the unique values. You can do that by going to Data, Filter, Unique Values Only.