SQL Server 2008 R2 CTP - refer to documentation to know what's new!
In response to the SQL Server 2008 R2 CTP post I have had flurry of emails asking what more they can learn on 'What's New' compared to the existing SQL Server 2008 RTM which has celebrated its first birtday!
As a general recommendation I always recommend to download the latest update of SQL Server Books Online (BOL) from MS Downloads site, you can follow the same to install BOL too if you have installed the CTP as a fresh install on to a seperate machine. Rather than disturbing existing 'working-order' server it is a best practice to run your Proof-Of-Concept (POC) based tasks by using a Virtual Server or VM based machine.
Let's say if you had a limited choice of having seperate machines (Virtual) in your environment then there is an obvious reason to have SQL Server 2008 R2 CTP to be installed as a seperate instance. But in the case of BOL I would recommend to refer to web based BOL within MSDN documentation site. The next set of questions I had is 'What's New', the reply is in the question!