I've been using WMI to write scripts to monitor services, cpu usage, memory, disk space, etc. and everything has worked great so far. I want to be able to monitor individual application pools to tell if they are working but i can't seem to find a way. Does anyone know how to do this with ADSI or WMI or even a commerical application? The whole point of this is to send myself an email when something happens so the built in stuff in IIS is not flexible enough.

Hello,
Please take a look at http://monware.com
Written in C# fully managed code and used WMI technology.

Heres an example:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/iissdk/iis/monitoring_the_state_of_application_pools.asp