Microsoft has just announced that SQL Server 2008 has been released to the public.
You can download the Eval edition as of today from the Evaluate Microsoft SQL Server 2008 webpage. It’s has been released in a variety of languages including English, French, German, Spanish and Chinese. Technet Plus subscribers can download it today, while retail packaging should be in stores shortly.
(Do note that the main SQL Server 2008 webpage doesn’t show the release yet. I heard about it via the TechNet newsletter.)