I was not asking about logging in SSIS, I was asking about logging in Legacy DTS packages running under SQL Server 2005.
I was able to find out what was going on. Legacy DTS packages are still logged to the same tables as under SQL 2000, msdb.dbo.sysdtspackagelog and msdb.dbo.sysdtssteplog, provided you have package logging to SQL Server enabled in the DTS package properties.
2005 SQL Server Management Studio does not provide the ability to look at Legacy DTS package logs, so you have to use a query to look at the logs.
Example query, modify to suit your needs:
pklog.name as PackageName ,
stlog.stepname as StepName ,
stlog.stepexecutionid as StepExecutionID ,
stlog.starttime as StepStartTime ,
stlog.endtime as StepEndTime ,
stlog.errorcode as StepErrorCode ,
stlog.errordescription as StepErrorDescription
on stlog.lineagefull = pklog.lineagefull
stlog.errorcode <> 0
and stlog.starttime > DATEADD (day, -15, getdate())
CODO ERGO SUM