Things to try when Content Deployment hangs

FYI - There's this list in Central Administration:
http://server/Lists/Content%20Deployment%20Jobs/AllItems.aspx


Restart the timer service on each web server:
With PowerShell:

$serviceName = "SPTimerV4"
$serverNames = get-content "ServerNames.txt"
foreach ($serverName in $serverNames)
{
write-host "Restarting SharePoint Timer service on" $serverName
$serviceObj = Get-Service -Name $serviceName -ComputerName $serverName -ErrorAction Stop
Restart-Service -InputObj $serviceObj -erroraction stop
}

Clear the SharePoint Configuration Cache
Adapted from http://blogs.msdn.com/b/josrod/archive/2007/12/12/clear-the-sharepoint-configuration-cache-for-timer-job-and-psconfig-errors.aspx
Stop the OWSTIMER service on ALL of the MOSS servers in the farm.
C:\ProgramData\Microsoft\SharePoint\Config\GUID\
NOTE: ONLY THE XML FILES, NOT THE .INI FILE: Delete all the XML file in the directory.
Open the cache.ini with Notepad and reset the number to 1. Save and close the file.
Start the OWSTIMER service on the Index server and wait for XML files to begin to reappear in the directory.
After you see XML files appearing, repeat steps 2, 3 & 4 on each server, waiting for XML files to appear before moving to subsequent servers.


Check the ULS Logs


Check the Windows Error Logs
There might be a SQL Server error, for example.


Delete the Destination Site Collection
Delete the destination Site Collection
get-spdeletedsite -webapplication http://samplesite.com | Remove-SPDeletedSite
Central Administration > 'Monitoring' > 'Review job definitions' > 'Gradual Site Delete' http://samplesite.com > 'Run Now' button.
Re-create the site collection with no template.
Delete the Content Deployment Path
Re-create the Content Deployment Path
Re-create the Content Deployment Job
Run Content Deployment Test
Run Content Deployment.


References:
http://blogs.technet.com/b/stefan_gossner/archive/2010/04/08/content-deployment-the-complete-guide-part-9-timerjobs.aspx
http://blogs.msdn.com/b/josrod/archive/2007/12/12/clear-the-sharepoint-configuration-cache-for-timer-job-and-psconfig-errors.aspx
http://blogs.technet.com/b/stefan_gossner/archive/2009/01/16/content-deployment-best-practices.aspx?PageIndex=2
http://blogs.msdn.com/b/jamesway/archive/2011/05/23/sharepoint-2010-clearing-the-configuration-cache.aspx