1 Ping Attacks
2 IP Spoofing
4 SYN Flooding
5 Mail Floods
They can be prevented by not opening the mails that you do not know
By using mostly Fire Fox as it is secure more than Internet Expolorer
Download security software like spybot Search and Destroy, to find kill all those spyware.
I personally dont think is good that such info can be freely given, how ever information always gets a way getting out, the best way is to teach people how to protect themselves from such.
Yes, i think they should, so that they will be able to warn people and protect themselves from any hacker and their maiciuos ways of damaging peoples network.
Also it is not good for business as many people would fear to do business on the net, as the result the it site of business would be useless.