SQL Server 2008 ("Katmai") June CTP now available for download
You can now download the June CTP of SQL Server 2008 ("Katmai") from the Microsoft Connect site. Downloads are available in executable or iso format and x86 and x64 versions. The June CTP of SQL Books Online (BOL) is also available. Note that you do need need to register for the CTP in order to download the files.
Connect SQL Server 2008 site