Active Directory Check?

Hello;

I was wondering if anyone has any suggestions for how I might be able to test several AD Domains and show the results in Xymon?  One of my AD domains became unresponsive today due to DNS (not Microsoft DNS) and the delay in notifying us caused lots of heartache.

I did see Buchan's OpenLDAP tests, not sure if that is the right way to go, or even if it will work.

Thanks,

.vp