Nothing in the wild exists, but proof-of-concept viruses have been demonstrated, proving that even Mac OS X isn't flawless. You will likely never see anything in the wild, but my point is that anti-virus software is never a bad thing to consider.
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Free virus scan for macbook?
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To consider? No. To use? Well... that depends on the costs/benefits. In this case, the benefit is near-zero (no viruses in the wild, see above), while there is both a financial cost and a CPU/RAM cost.
Personally, I'd skip out on the "antivirus" software for now.
Then again, I run BSD and Debian on almost all my systems, so the concept of allowing potentially-malicious software to run on my machine is somewhat foreign to me.
No, it's really not. Just wastes resources and time, however little.
"Anti virus" pretty much works by detecting known rubbish: even if you have super unbelievable Norton AntiVirus 360 Mac edition 8.3.2 (!), you'll still be susceptible to everything if it's brand new (which would always be the case for OS X).
"Anti virus" isn't something you could even attempt to rely on in OS X if you're paranoid about "viruses" in my opinion
P.S. I absolutely hate the stupid naming of everything like "viruses" and "anti virus", hence the nice quoting
I've got some bad news for you... iAntiVirus is pretty close to worthless.
I've gone over the list of threats that it claims to protect against, and... well... take a look.
