The following products are available for download.

Microsoft Visio Premium

Microsoft Office 2010

Microsoft Exchange 2010

SharePoint Server 2010

Project 2010

Project Server 2010

Office Web Applications 2010

Microsoft FAST Search Beta

SharePoint Designer 2010

The link to download them is given below 

Download: http://www.microsoft.com/2010/en/

The announcement: http://www.microsoft.com/presspass/features/2009/nov09/11-18PDCKurtDelBene.mspx
The announcement: http://www.microsoft.com/presspass/presskits/2010office

Last night I installed the beta bits on my Windows 7 64bit.  SharePoint 2010 is working nicely.  Although I faced many problem but thanks to Microsoft bloggers for providing instant help on these problems.