This blog is just to have a central repository of all the official guides available for installation and configuration of various supported versions of BizTalk Server and BizTalk Adapter Pack:
BizTalk Server 2010 Documentationhttp://www.microsoft.com/en-us/download/details.aspx?id=11503
BizTalk Server 2009 Installation and Upgrade Guideshttp://www.microsoft.com/en-us/download/details.aspx?id=4066
BizTalk Server 2006 R2 Installation and Upgrade Guideshttp://www.microsoft.com/en-us/download/details.aspx?id=20725
Quick Start Guide to Installing and Configuring BizTalk Server 2006http://msdn.microsoft.com/en-us/library/aa577356(v=BTS.20).aspx
BizTalk Server 2004 Installation Guidehttp://www.microsoft.com/en-us/download/details.aspx?id=410
Microsoft BizTalk Adapter Pack 2.0 Installation Guidehttp://www.microsoft.com/en-us/download/details.aspx?id=18352
Microsoft BizTalk Adapter Pack 2010 Documentationhttp://www.microsoft.com/en-us/download/details.aspx?id=1325>
And following is the link to another KB article which has the list of all the Cumulative updates released so far for various versions of BizTalk Server and BizTalk Adapter Pack.
Service Pack and Cumulative Update list for BizTalk Serverhttp://support.microsoft.com/kb/2555976