The Beta 2 build of BizTalk Server 2006 is now available on Beta Place.
This also includes a separate download for the Microsoft BizTalk Adapters for Enterprise Applications, also in Beta 2.
You need to be enrolled in the public beta program to have access to this download.
An updated BizTalk 2006 Beta 2 installation document and known issues can be found here.
I thought the CTP build was awesome so I can not wait to get this version installed and running.