This was just made available today.
I've been keeping an eye on it because my Office 2007 trial just expired, was gonna stump up the cash until I realised 2010 would be coming soon.
Free to use until early April 2010, although I'm having trouble accessing the download right now. I'm guessing that's because the site is getting mad traffic.
http://www.microsoft.com/office/2010/en/default.aspx
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