http://blogs.technet.com/keithcombs/archive/2008/07/08/isa-server-2006-sp1-now-available-for-download.aspxISA Server 2006 is a great firewall product.  As with all of our products, it continues to be improved and SP1 offers up some new goodies as well as a bunch of fixes.  Here’s the list of new features: Configuration Change Tracking—Registersen-USCommunityServer 2.1 SP1 (Build: 61025.2)