There are a number of things that weren't demonstrated in this blog posting...

Most likely his Flash is beta... which isn't a great thing... and now that he's away his parents will not be able to easily get their flash updates as they would if they were running Windows..

He didn't mention disable services.. so now they've got a basic user account with probably an easy to remember password... and SSH sitting open..

He had to get additional hardware for their internet to work..

You have yet to prove anything... this is another linux-zealot promoting Ubuntu for a very basic computer user (Which I believe in your last thread I said would be somewhat OK)...

In fact
Ubuntu is like SuSE and only slightly better than most other Linux distributions.. in that it is geared for two types of people.. Person A is highly technical... Person B knows nothing about computers and emails her grandchildren and surfs the web for recipes... The inbetween people.. there still isn't a Linux for them... Linspire might actually come closest... Linux still has a ways to go...
There's exactly what I said... this is what his parents are doing... I could argue this but you:
A) Are a Linux Zealot
B) Don't listen to reason
C) Really have no clue.

Peace,
HT