The next version of the AMC by Citrix is finally aiming to be MMC compliant!  I'm pretty excited about this because I think the AMC is one of the buggiest features of XenApp.  Getting this so it's a universally accepted standard is a step in the right direciton for Citrix.  Right now this new version of the AMC is only for Web Interface but the hope is that they would continue to move all AMC to these standards.  To check out the beta, and learn more check out the link below:

<a href="https://www.citrix.com/English/ss/downloads/details.asp?downloadId=1687206&amp;productId=186">https://www.citrix.com/English/ss/downloads/details.asp?downloadId=1687206&amp;productId=186</a>