The enterprise ZenPack (ZenPacks.zenoss.IncidentManagement) provides SOAP interfaces into ServiceNow (current and 'Berlin' versions) as well as other systems.  This ZenPack is usually done as a Zenoss Professional Services engagement because (so far) every customer wants their workflow integration to be unique.  The ZenPack will work with 4.1.1 as well as 4.2+.

Current feature list (off the top of my head)

* button to send an event from event console into the ticketing system with comments

* manual updates of events can update tickets

* can poll the ticketing system to look for status changes in tickets and act on them

Note that the ticket creation piece is available as a regular event notification from the pick list, so you can create multiple ServiceNow ticketing areas (eg Dev vs test).

Hope that helps.

kells