You may wonder what is worth reading or writing about a readme file, I'll try to explain. Of course if you are installing the June CTP release of the Developer version of Microsoft SQL Server 2008, you will find this information valuable since there many problems you have probably faced are informed and even work arounds are summarized.
Ok, first important information. If you have not realized yet, be aware that the readme file within the installation package is not up-to-date. So you will need a newer and updated readme file that targets your bugs or problems especially regarding with the installation and side by side running of SQL 2008 and SQL2000 also SQL Server 2005.
Here is the download link for the readme file for Katmai, http://connect.microsoft.com/SQLServer/Downloads/DownloadDetails.aspx?DownloadID=6834
Of course you have to register for the connect.microsoft.com site
The version of both the SQL Server 2008 June CTP and the read me files are 10.00.1019.17
In short, you will find a valuable list of known issues and related information about SQL Server 2008 (Katmai) June CTP.