Other than the fact that you could've used a more unique or creative font, the only thing I see wrong with them is the top left edge. It looks a tad choppy/rough. And maybe the bottom right. Also, I'm not sure how you'd explain it, but some of the lines you used for the gloss look seem a tad unnatural or random. Overall, it works, but on closer inspection, they could use more direction. It's hard to explain exactly what I mean, though.

Otherwise, they look pretty damn good, but what exactly are they for? Dock icons?

Dock icons, so I went for aestitic rather than realistic, but I get you, thanks. Edges are rough, I should have gone over the shape with the pen tool... Ah well. =P

Wow iiPod, I love these. However, I got two problems. One as mentioned, the top left corner isn't hot. And the very first icon, I don't know, it just looked like when scrolling fast like it was covered in dust. Hmmm.

Covered in dust? OK... xD And thanks. =)