We had an issue today with our Oracle server. 

First this came up:

Event Type: Error
Event Source: Srv
Event Category: None
Event ID: 2019
Date:  2/01/2009
Time:  11:33:46 AM
Description:
The server was unable to allocate from the system nonpaged pool because the pool was empty.

Then this:

Event Type: Error
Event Source: EventLog
Event Category: None
Event ID: 6008
Date:  2/01/2009
Time:  11:39:44 AM
Description:
The previous system shutdown at 11:39:39 AM on 2/01/2009 was unexpected.

Yep right in the middle of the day the server crashes and to top it all its a production Oracle server. Have got memtriage and Poolmon running on it to monitor nonpaged pool. Will post back with results.