<p>I have a interest in a <a href="http://support.microsoft.com/kb/941132/en-us" rel="nofollow noreferrer">reported bug</a> which Microsoft have made available a hotfix for. When looking on the site, I'm not able to figure out if this fix is included in a service pack or not. Do anyone know where I can find this out?</p>

You didn't mention your product but:
List of fixes in Service Pack 1 for XP:
http://support.microsoft.com/kb/324720
List of fixes in Service Pack 2 for XP:
http://support.microsoft.com/kb/811113
List of fixes in Service Pack 3 for XP:
http://support.microsoft.com/kb/946480
List of fixes in Service Pack 1 for Vista:
http://technet.microsoft.com/en-us/library/cc749061.aspx