This whitepaper is a collaborative effort between members of the MSMQ, "Indigo", SQL SSIS, SQL SSB, SQL Replication, Host Integration Server and BizTalk Server teams. The whitepaper describes the core use-cases for these technologies and when to use which technology. Accompanying this whitepaper are the TechEd session which I delivered this week and will be on the TechEd DVD.
This paper will be posted to the SQL, BTS MSDN dev centers in due course. If you want it now then go to groups.msn.com and join the biztalkserverstuff group and then download the file from here (otherwise you will get a download error). If someone knows of some free web space I can use until blogs.msdn.com supports file uploading let me know.