From nosleep software:
The Super Analyzer looks at your iTunes music library and creates a variety of charts and statistics that tell you interesting things about your music tastes and listening habits. It is the perfect complement to anyone who uses iTunes. A few of the charts are shown below: you can see how many songs you have in each genre and from each year, and what time of day you listen to the most music, what artists/albums/genres/decades you listen to the most, and how quickly your collection is growing.
Share your stats! You can save individual graphs as image files to email to friends, or save a complete summary as a PDF document or webpage that you can put on your website.
What's new in this version:
The 3.6 update to the Super Analyzer adds complete support for German and adds support for exporting album lists that include artists and albums with Asian characters in their names.