How to make sure it's really gone?

[Jim]

Let's assume I have some data on a Dreiser's or ext3 partition.  Short 
of removing the drive and smashing it, how can I make sure with 
reasonable certainty the data is gone?

I looked at the manage for shred and it says it doesn't work on 
journaled file systems such as ReiserFS, Ext3 and others.  Is there 
something that will do the job on an ext3 or reiserfs partition?

Thanks