You can use Windows PowerShell to display the Event Receivers connected to a List in SharePoint 2010. You can simply connect to the List and use the Event Receivers Property:
PS > $spWeb = Get-SPWeb http://SP01.powershell.nu
PS > $spList = $spWeb.Lists["Tasks"]
PS > $spList.EventReceivers
PS > $spWeb.Dispose()
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Apr 10 2012, 06:00 AM