UPDATE!!: Microsoft have now (27/04/2008) released the final redistributable CAB files. The below are the final English language CAB files you need for a BizTalk Server 2009 installation on Windows Server 2008:
32bit: http://go.microsoft.com/fwlink/?LinkID=137254
64bit: http://go.microsoft.com/fwlink/?LinkID=137261
The installation guides have links to the redistributable pre-requisites for other languages and operating systems.
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The pre-requisites CAB files available at the moment for BizTalk 2009 on Windows Server 2008 are:
32bit: http://go.microsoft.com/fwlink/?LinkId=81432
64bit: http://go.microsoft.com/fwlink/?LinkId=81423
These CAB files have version 8.0 of ADOMD.NET in them. If you run into a problem with the RTM version of BizTalk 09 asking for version 10 of ADOMD.NET, you can download it from here:
32bit: http://go.microsoft.com/fwlink/?LinkId=130651&clcid=0×409
64bit: http://go.microsoft.com/fwlink/?LinkId=130652&clcid=0×409
Regards,
Thiago

[...] If you want to download the CAB files before the install, Thiago Almeida has links to the latest versions on his Connected Thoughts blog. [...]
Pingback by A Quick Walkthrough of the BizTalk 2006 R2 Upgrade to BizTalk 2009 RTM | Nick Heppleston's BizTalk Blog — April 12, 2009 @ 1:02 am
Is there any CAB file for Windows 32-bit OS?
Comment by pavan — July 22, 2010 @ 12:55 pm
Yes, it’s the first link of the post:
http://go.microsoft.com/fwlink/?LinkID=137254
Comment by Thiago Almeida — July 22, 2010 @ 1:16 pm
[...] encounter any of these. Thanks to my friend Thiago Almeida for pointing out the ADOMD 10 error (http://connectedthoughts.wordpress.com/2009/04/06/biztalk-2009-rtm-prerequisites/). I had seen this during the TAP version and unfortunately it looks like a final bug. The [...]
Pingback by BizTalk 2009 RTM « MS Innovations Blog — September 30, 2010 @ 4:31 am