An iPhone 2.0 Software Update was available on Apple servers on Thursday. Apple has not though officially made the 2.0 Update available yet. They actually asked MacRumors who posted the download link to remove that link.
Engadget reports that they experiences some problems with iPhone 2.0 update on original iPhones. So best is to just wait until Apple makes the update official.
The iPhone 2.0 Software Update will be announced on this page on the Apple site.
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