Microsoft have released today two important cumulative update packages. They follow the same approach of cumulative updates that have been successful with SQL Server and BizTalk Server 2006 R2 SP1 for a while now.
The first is the Cumulative Update Package 1 for BizTalk Server 2009 (KB 2429050). It contains 60 fixes with 55 applying to BizTalk Server 2009 and 5 to UDDI as well as added support to HIPAA 5010. The release has 32 and 64bit downloads and can be obtained either by contacting Customer Services or by requesting the download via the online self-service feature.
The second release is the Cumulative Update Package 1 for BizTalk Adapter Pack 2.0 (KB 2444952) and it includes 11 fixes that apply to the SAP Adapter, Oracle Adapter and the baseline framework itself. It applies to any system using the BizTalk Adapter Pack 2.0 (and .NET solutions consuming the adapters, BizTalk Server 2006 R2 SP1, and BizTalk Server 2009).
Like all releases ensure you try them first on a test environment and run regression tests to make sure there are no breaking changes. On my standalone development machine both installations ran without issues and did not require a server restart (the BizTalk Serve 2009 restarts a few windows services though).
Most of the hotfixes are already in BizTalk Server 2010. Very likely the same Cumulative Update approach will be taken for any future BizTalk Server 2010 updates as well and we may see them coming up next year.