Quoting Ben Stallings (Ben at Workscited.Net):
> Now let's say you foresee this situation and do in fact install some sort of 
> back door.  What software do you use?  How do you secure it so that other 
> people don't hack her computer?  How do you make it easy enough for her to 
> start when she needs to without being so obvious that she starts it 
> unnecessarily?  --Ben

The read-only FS stuff is a good idea, but can make install updates/patches and
pain for -you- when it comes time.

Installing tripwire is a better idea, IMHO.

Install sshd, disable root logins, enable X forwarding.

Setup iptables, lock down everything except ssh access from your box (assuming
you have a static IP).

Log everything to, I normal do:

	*.debug		/var/log/syslog

Probably want to add an entry to logrotate for it as well.

If you are -really- anal.

Install SNARE and log all API calls.
If you got static IPs on each side, setup IPSEC.
Run neuss against the each box and make sure there is no warnings.

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