My iTunes library is not located in the default location in my ~/music/ folder, it's deliberately placed off the root of my drive, as it has been for years. I wanted to try out CoverScout, but was disappointed to find that when I opened it, all I could do was click a Quit button.
Apparently because my iTunes library is not in the default location, CoverScout can't find it, and doesn't give me a browse option.
I imagine this probably isn't going to be an issue for most people, but it's too bad the program doesn't let me locate the library, since it seems like it'd be a nice app, and as it is, I can't run it -- maybe this will be added in a future version.