Just chased down a web application issue with this
Determined that a form data from a POST from the client was fragmenting into several packets, and the client request for an updated page based on the form data was being processed sometimes before all of the data packets.
I know that the limitation with this is that it will only see packets directed to the computer running it. From my understanding of how network switches work, that is a mute point anyway. I believe that even in promiscuous mode, an adapter will not be able to monitor what does not reach it. Any insight anyone has about monitoring traffic between two "other" ethernet devices would be appreciated.