I've used a PC for years and would consider myself well versed in security measures for PC's. I am helping out a relative who has just bought a new iMac and need some advice from Mac experts.
I appreciate that the number of threats targetting Apple Mac's is significantly lower than PC's, but should I install an Anti-Virus and/or Firewall onto the iMac? My years of dealing with PC's make me feel very vulnerable sitting at a computer without these running

If someone could help answer this question and then point to some good (free?) software solutions it'd be much appreciated
