I tend to keep my music on shuffle mode and the iTunes player window in the mini-player shape and I just discovered that I couldn't drag a folder of music to it.
OK, that isn't a direct screen shot, but a re-creation of what my mind's eye saw, to the pixel.
What I would expect from software that "just works" is for iTunes to happily accept the folder, import it to my library and maybe even start playing it.
Please fix that.
(Observed in iTunes 10.2.2.)