Here;s the message from my Event Viewer log:
The Crash occured near the end of a track (-10 sec)... about where the next track would begin to crossfade in.
I'm using the dynamic transition plugin, as well as Erlands suite of goodies.

Event Type:	Error
Event Source:	Application
Event Category:	None
Event ID:	0
Date:		11/21/2006
Time:		11:18:55 AM
User:		N/A
Computer:	MEDIACENTER
Description:
The description for Event ID ( 0 ) in Source ( Application ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: Carp::Clan::__ANON__(): Error executing 'UPDATE tracks SET lastplayed = ?, playcount = ? WHERE ( id = ? )': DBD::mysql::st execute failed: Lock wait timeout exceeded; try restarting transaction at C:\Program Files\SlimServer\server\CPAN/DBIx/Class/Storage/DBI.pm line 771.
.

This occured a few minutes after this:

Event Type:	Information
Event Source:	Media Center Scheduler
Event Category:	None
Event ID:	4
Date:		11/21/2006
Time:		11:16:41 AM
User:		N/A
Computer:	MEDIACENTER
Description:
The next scheduled download of the latest television listings guide (EPG) is 11/22/2006 11:13:56.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.