So I'm a little anal about it, but it's not OCD. OCD is a
disorder that causes undue stress in someone's life. This might be annoying to have the box around an icon, but it's not causing me distress that affects my life.
I think the black box is a little useless with the drive menu that's in the finder window. Yes, I like it when I click once and the icon is highlight/boxed. However, if I double click it and it opens a menu, the box serves no purpose. In fact, if I double click the Mac HD icon, Finder boxes it, and then I select my iDisk in the menu on the left of the file window, the box doesn't appear around the iDisk. Instead it remains around the original hard disk icon.
Anyhoo, the thing that I don't like is the fact that the icon still has the box around it when you close the window. I would prefer the box to go away. (I can live with the box being present while the window is shown.)
Call me anal about it if you want, but everyone has their own anal tendencies (including some of you teasing me about me being anal).