You took the words right out of my mouth. ;)

Alright. I'll spell it out for you then. All of the names of your images are 100% lower case. However, in your .plist file on several occasions, you capitalize the first letter of the names of the picture in question which causes a difference in case. This is a problem for a user like myself, who while installing OSX, chose to have the drive case-sensitive. If you honestly don't know what that means, it means I could have the files "Awake.png" and "awake.png" on my Desktop and have no problems because they're named differently. (Different case.) So when there are discrepancies like that in your Dock Icon package, it becomes an issue. It wasn't a big deal for me seeing as how I quickly figured out what was wrong, but you should really rename all of the pictures so they start with a capital and make the .plist match that.

Well lucidos, it's quite the set, but there's one slight problem... The case on your pictures and your .plist file don't match up so when I ran it, I had no dock icon due to my case-sensitive drive. I fixed my copy up, but you should really update the original.