Matt Goyer answers the question on why Vista's Media Center uses all Caps for albums that MCE can't find cover art for.

But what's even better is if you look closely at his screenshot displaying a example of what Matt is talking about, you can see it uses a different non-Aero theme. Its no longer using the "Scrap Metal" theme when Vista is unable to utilize Windows Aero and Glass.

Some may be able to see the difference while others might not but its different. I dislike the way the maximize, minimize, and close buttons are so small. I also dislike how thick the borders are and how there isn't any real transition from the application into the window frame. You can check out Matt's full screenshot here.