Looks nice. I'm not sure if you're looking for suggestions, but if I were you, I'd add a little to the front cover. The gradient blue is just the right tone, however, it looks kind've plain. Have you considered adding some monochrome design layered over it, like that default "flower petal" wallpaper that comes with Fedora 1 and 2?
Sorry, I've moved on from the world of Linux to a Mac OS X, so I can't help you there. If FC3 doesn't include the flower petal background by default, however, I wouldn't recommend putting it in there anyway. See if you can find something FC3 specific to throw on there, be inspired!
Also, I forgot to mention something. I assume English isn't your first language from the paragraphs and labels. I'd reccommend you find someone with a better grasp on English to take a look at it and give you some advice on wording.
Hello thanks for the comment, yes english is not my firs language. My first language is Indonesian.
for the title honestly i confused what title is suitable, and for the text is only the preview i think if fedora is interest of using this layout they could add text that they want.