[Tfug] debian 4 security

[ericdanc at alice-dsl.net]

I have 1 or 2 PCS plugged directly into a dsl-modem, no LAN and just 1 
user (me). Since the pppoe-connections are temporary with dynamic 
ip-addressing, an iptables-firewall probably isn´t needed or possible. 
I, however, want to feel comfortable connecting to my bank, fund manager 
etc.  Except for ps aux, dmesg etc., somehow i don´t feel like i know 
what´s going on in debian:  it´s so "quiet" compared to, say, vista, 
where it´s hand to hand combat every day when you´re connected.
So, given my minimal system, are there security tools (weapons), like 
intrusion detection,  a list of services I should turn off or whatever?
Eric