This is a link to Scott Schnoll’s weblog where he goes through a step by step guide to install Exchange 2010 Beta. It is an interesting read and I followed his steps when installing the beta in my own lab environment. Click this link to visit the guide. I found a few gotchas in Brian Ricks’s blog

After installing it myself i have some gotchas and experience

• The beta does not support coexistence with  older Exchange versions, not even Exchange 2007. So when i tried to install it in my lab environment the readiness check stopped me and I ended up creating a new domain for the Exchange beta
• Got the  “The WinRM client cannot process the request”. This is because the wrong version of WinRM was installed. Download WinRM 2.0 CTP3 here