Microsoft just released SharePoint 2010 Beta 2!  Beta 2 will consist of build 14.0.4536.1000.  

For Beta 1 users only or partners running an earlier version e.g. 14.0.4514.1009 (Beta 2 Escrow), you can upgrade to Beta 2 by installing this update:  KB_COMING_SOON


Download your copy of SharePoint 2010 Beta 2 from MSDN Subscriptions
(Subscribers only at this point)

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Notes:
PLEASE REVIEW the hardware and software requirements for SharePoint 2010.  These include cumulative updates and hotfixes for SharePoint 2010 to install properly

http://technet.microsoft.com/en-us/library/cc262485(office.14).aspx

At last news, Beta 1 and Beta 2 will time-bomb (expire) on October 31, 2010.

Setting up a development workstation running SharePoint 2010

http://msdn.microsoft.com/en-us/library/ee554869(office.14).aspx

Summary of other great resources on SharePoint 2010


Official Microsoft SharePoint 2010 Website
http://sharepoint2010.microsoft.com

SharePoint 2010 on MSDN   
http://msdn.microsoft.com/en-us/library/dd776256.aspx 


SharePoint 2010 on TechNet
http://technet.microsoft.com/en-us/sharepoint/ee263917.aspx


SharePoint 2010 Technical Articles on TechNet
     
http://technet.microsoft.com/en-us/library/ee428287(office.14).aspx 


SharePoint Developer Center
http://msdn.microsoft.com/en-us/sharepoint/default.aspx


SharePoint 2010 Development Hands On Labs
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=c010fc68-b47f-4db6-b8a8-ad4ba33a35c5#filelist