After setting up a crawl rule to crawl something other than SharePoint sites (such as a file share), you may encounter some errors for SQL Server.  If you start to see these repeatedly - check that you have the latest service pack for Microsoft SQL Server 2005 installed.  That will resolve your issue. 

Event Type: Error
Event Source: MSSQLSERVER
Event Category: (2)
Event ID: 17310
Date:  9/24/2008
Time:  11:09:30 AM
User:  N/A
Computer: YOURSERVER
Description:
A user request from the session with SPID 67 generated a fatal exception. SQL Server is terminating this session. Contact Product Support Services with the dump produced in the log directory.

- Dan