As a smug mac user, the one security point I often make to Windows users, is that I am not using a root level account by default, so unlike windows any malware on the mac (if there was any of course) could do only limited damage.
While my point is strcitly true, as this Mac Geekery blog post notes you are by default in OS X running an Admin account, which while not as scary as root, still offers more system level control than is really needed on a day to day basis.
The moral of this story is to change your user account to a standard account now, it’s very easy to do, as explained by Mac Geekery, taking just two minutes, and you will be that bit more secure..