Service Pack 1 for BizTalk Server 2004 has shipped.  Remember to check the READ ME.

Get BizTalk Server 2004 SP1 here.

Prerequisite software:

• Microsoft .NET Framework 1.1 Service Pack 1 is required on all platforms.
• BizTalk Server 2004 SP1 Update for .NET Framework 1.1 is required on all platforms (Windows XP/2000 or Windows Server 2003).
• Windows XP Service Pack 2 is required on the Windows XP platform.