Only things I see are that the audio track name which is a dark blue is over that dark background on the logo screen. That is going to be kinda difficult to see.
Also the size of the font on the music page seems small. On a 7" screen it looks like it might be 1/8" or smaller.
And the last thing is, when are you going to be calculating the inverse tangent of things while driving?!
Pretty all frontends allow other programs to be "skinned" as well, so you could just skin the built in calculator of xp.
Other than that looks like a good brushed metal skin.