[tlug] Repairing a Possible Attack

[CL <az.4tlug@example.com>]

Between 23:30 last evening and 06:30 this morning, over 150Gb of disk 
space on my desktop PC -- running Kubuntu 9.10 -- has disappeared 
leaving me zero disk space.  I suspect Something Bad (tm).
Before nuking the entire installation and doing an NSA wipe of the HDD 
is there some easier way of identifying the problem and eliminating only 
the bad parts and patching?  Like listing all files that have been 
written since a certain time / date; listing by size, listing what 
system changes have occurred?  etc?
Most of what was on the drive is expendable and data exists elsewhere. 
It is a simple matter of reinstalling the OS if that's what it comes 
down to.  But, if there is an easier way to get at the problem and close 
the barn doors ...
--
CL