Geekstyle: If he was a bit smarter...

...., he could have taken down the internet in 3 hours. Seriously.
Having a look at decompiled source for Blaster virus, you will find out that this simple program could be an evil but it is not.
Networkers know the power of "TOS" and "Precedence" bits in IP header. All routing information packets and control information in a network have tweaked TOS and Precedece in their layer 3 header. It means they will not be delayed in queues and are transmitted on the network with the highest priority. Now assume that this worm has tweaked TOS and Precedence to the highest priority, and boooommm!

Got the idea?