Security expert Sophos is recommending users to switch to a Mac. The security company also found that Trojans dominated the list of threats in the first half of 2006. Of the top ten malwares reported in the first six months of 2006, none were able to infect Macs.
More Information:
Sophos - Sophos Security Report reveals Trojan domination in first half of 2006
BBC - Web perils advise switch to Macs
Apple - Switch to a Mac.