I found this sheila in my shed today, about 30mm in length. Probably the biggest I've seen yet. This is called a white-tail or white-tipped spider. There are a lot of myths going around about necrotic wounds, people's flesh rotting and dropping off and what have you.....
Full story here.
P.S. if anyone you know has been bitten by CONFIRMED white tip spider, I am researching them and would love an email detailing your symptoms, prognosis and doctors advice, treatment and any other details about the incident.