The Host Integration Server Product Team has just released the second Cumulative Update (CU) for HIS 2009. The cumulative update model is used to package and release product fixes on a more consistent schedule.
HIS 2009 CU2 includes fixes for HIS 2009 that were fixed after the release of HIS 2009, including all the fixes that are in HIS 2009 CU1. Details on the included fixes can be found in the following Knowledge Base article:
2645939 Cumulative update package 2 for Host Integration Server 2009 http://support.microsoft.com/default.aspx?scid=kb;EN-US;2645939
HIS 2009 CU2 includes 7 new fixes that were not included in HIS 2009 CU1.
You can download HIS 2009 CU2 via the View and request hotfix downloads link in the KB article. You would need to download the CU2 package that matches the HIS 2009 version (x86 or x64) that you have installed.