Is it better to setup a ordinary user account for daily use rather than use the administrator account for general daily use?
As the only user of my macbook would I be advised to do this from a security standpoint?
I did run a standard user account for a short time and then went back to using an admin account.
The reason being that automatic software update will only run on an admin account, using a standard user account requires manual activation of software update.
From my point of view I regarded the possibility of my system being behind on security updates as a negation of the possible benefits of running as standard user.
Whether you run a standard or admin account makes no difference. No viruses exist in the wild that can run on Mac OS X, and there never have been any, since it was released 10 years ago. The handful of trojans that exist can be easily avoided with some basic education, common sense and care in what software you install:
The first section of that link deals specifically with the MacDefender/MacSecurity/MacProtector/MacGuard issue, which is not a virus. I encourage you to read it.