Or better still, by Bulunga.
I was thinking hanged, emasculated, disembowelled, beheaded and quartered, but I think I like your idea better.
From the link you posted, I like this one:
In early historic times in Siberia, a condemned prisoner would be tied naked to a tree and left to slowly die through starvation and blood loss from mosquitoes, horseflies and other insects.
I like that. Also, put them in a room and expose them to nuclear radiation when critical mass happens. They will get severe radiation poisoning and die a horrible and agonizing death.
http://en.wikipedia.org/wiki/Critical_mass
http://en.wikipedia.org/wiki/Criticality_accident
Remind me not to annoy you.
Look up from home.