http://www.microsoft.com/downloads/en/details.aspx?FamilyID=b4579045-b183-4ed4-bf61-dc2f0deabe47
The core client DLLs are now available as a separate download.
The strange thing is that when you install these on your machine it still puts them
under the c:\program files\common files\.\Web Server Extensions etc.
The main dlls are:
1: Microsoft.SharePoint.Client.dll
2: Microsoft.SharePoint.Client.Runtime.dll
& the Sliverlight client dlls.
Given the directory paths, it maybe worth just grabbing the dlls you need for you
solution and deploy them as part of the package.
Blog Post by: Mick Badran