Antivirus for mobile...

Are you using a antivirus program for your mobile? I am using AVG free antivirus on my Droid X and Xoom - haven't seen anything that I have downloaded yet that has caused any issues - and as long as I am updating the antivirus program.

I'm thinking that all Android OS mobiles and tablets should have some type of antivirus software included with the device - something that doesn't expire after 30 days like the bloatware included on my desktop and laptop computers.