In answer to "what's the difference", well, I hate to say it, but why not try reading the release notes, or take a look at the fedora homepage, because I REALLY can't do justice to your question in a paragraph or two :-)
As to "that ugly bluecurve", if you mean the default x-windows theme, well, when you install fedora and select preferences -> theme from the menu, you will see "bluecurve, the redhat default" at the top of the list, but there are plenty of others out there!
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