Where did THAT file come from? 

# ls -l
total 176
-r-xr-xr-x 1 root root   1115 2011-12-08 11:16 cdromupgrade
dr-xr-xr-x 3 root root   4096 2011-12-08 11:16 dists
dr-xr-xr-x 3 root root   4096 2011-12-08 11:16 doc
dr-xr-xr-x 3 root root   4096 2011-12-08 11:16 install
dr-xr-xr-x 2 root root   4096 2011-12-08 11:16 isolinux
-rw-r--r-- 1 root root   1779 2011-12-09 18:26 ks.cfg
-r--r--r-- 1 root root 135344 2011-12-08 11:16 md5sum.txt
dr-xr-xr-x 2 root root   4096 2011-12-08 11:16 pics
dr-xr-xr-x 3 root root   4096 2011-12-08 11:16 pool
dr-xr-xr-x 2 root root   4096 2011-12-08 11:31 preseed
-rw-r--r-- 1 root root      0 2011-12-09 11:48 ; print $i
-r--r--r-- 1 root root    234 2011-12-08 11:31 README.diskdefines
lrwxrwxrwx 1 root root      1 2011-12-08 11:31 ubuntu -> .

It was a crazy couple of days. What was I doing just before lunch today? Oh yeah, something with a Perl one-liner...

Hey here's an idea (a few ideas, actually) for a presentation:
Transparent proxy cache with squid
Auto install via PXE of Ubuntu using Kickstart
TFTP
ISC DHCPd