Cancel all workflows in SharePoint 2010

If you've ever had a glitch where custom workflows are all in an error state or other circumstances where you just need to wipe the slate clean of the workflows genreated in SharePoint, use this PowerShell command from the SharePoint 2010 Management Shell:

foreach ($wf in $web.Workflows){[Microsoft.SharePoint.Workflow.SPWorkflowManager]::CancelWorkflow($wf)}

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Log Name:      Application
Source:        MSExchange ADAccess
Date:          4/8/2013 12:02:20 PM
Event ID:      2601
Task Category: General
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      Exchange10.domain.org
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Log Name:      Application
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Date:          4/8/2013 12:02:20 PM
Event ID:      2604
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Keywords:      Classic
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Process MSEXCHANGEADTOPOLOGY (P…
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