The latest CTP has just been released on the download center:

To download the CTP:
http://go.microsoft.com/fwlink/?LinkId=212469

To download the Install Guide:
http://go.microsoft.com/fwlink/?LinkId=212468

To download the Readme:
http://go.microsoft.com/fwlink/?LinkId=212467

What’s new in this CTP:

The following are new features that have been introduced since the Commerce Server 2009 R2 September 2010 CTP release:

  • Deployment scripts and sample configurations for two-tier and three-tier deployments
  • Support for rich Internet applications (RIAs)
  • Business data updates to live Web sites
  • Multiple orders from a single shopping cart
  • Updated solution files and extensions to Visual Studio and SharePoint Designer

Please review the README to understand additional issues that remain in the release and please be sure to post any issues you find to the Connect site.

The Commerce Server Team