I've a feature request for Album Art Viewer in DUI:
cover/back/disc can be maximized by double click on Album Art Viewer-element.
Covers are too small to read track/artist/album-details.

Yes, that would be a nice feature ....

I also would love this!

Good idea

Or perhaps allow it to just appear at some pre-defined size (half your screen, or whatever you choose) in a borderless window which disappears when clicked, rather than simply maximizing.

I agree that having an "enlarge" feature of some sort would be awesome though...

Yes, it would be very nice. I was just thinking of it.
Maybe a temporary full screen while maintaining down a mouse button ?

"To nobody, except those who will take pleasure here" (Franz Schubert, 1797-1828)

I second that emotion

Yup I'm in.

Or even better:
give us options to configure how foobar's album art behaves, if we click with the left (+doubleclick), right & middleclick. With a support for the keys like shift, ctrl & alt at best!

MP3Tag does it, by opening the image viewer (Faststone, here).