This is another John showed me. You know much of a pain in the butt it is to keep opening and closing log files while you wait for stuff to be written to them.
Not any more. SMS Trace from the Systems Management Server 2003 Toolkit 2 allows you to open a log file and it will "auto update" when the log is appended to!
You can get the Systems Management Server 2003 Toolkit 2 from here: http://www.microsoft.com/downloads/details.aspx?FamilyID=61e4e21f-2652-42dd-a04d-b67f0573751d&displaylang=en
PingBack from http://txtin.com/sms-trace/
Or you could always go with Tail from the Windows Resource Kit... :-)
http://www.microsoft.com/downloads/details.aspx?FamilyID=9D467A69-57FF-4AE7-96EE-B18C4790CFFD&displaylang=en