[issue]
In Windows Vista & Longhorn Server Beta 2, the WMI method GetExecutingRequests() does not work and returns an error "Invalid Parameter" when called in script.
Also, the relationship (Associators_()) between the ApplicationPool and WorkerProcess objects is broken (no WorkerProcess objects are returned when accessed using the Associators, however, you CAN obtain the WorkerProcess objects directly).
[workarounds]
You can workaround this issue by using the new Microsoft.Web.Administration managed code API's. Samples are provided at http://www.iis.net/default.aspx?tabid=2&subtabid=25&i=968.