This service pack is now available for download from the Microsoft download centre.

Overview
Host Integration Server 2006 Service Pack 1 delivers customer requested hotfixes that improve the quality, reliability and supportability of Host Integration Server 2006 and BizTalk Adapters for Host Systems.

A complete list of the customer hotfixes included in Service Pack 1 will be available in the following Microsoft Knowledge Base article:

979238: A list of the bugs that are fixed in Host Integration Server 2006 Service Pack 1