I read somewhere here that its very rare to get an actual virus on the V. I just watch out for the apps I download, and where I download them from. I stick with known games and apps. Amazon app store and Android market only . I try to read the permissions and read comments. I sometimes even disable permissions , if i feel like i need to
LBE Privacy Guard.. you can deny all unnecessary permissions in your apps..it also acts as a basic firewall so if anything tries to get access to your phone it will notify you and give you the chance to allow or deny it. This is much more powerful than any so-called antivirus.
Currently, there are no confirmed reports of any self-replicating malware on Android phones, so there are no viruses by definition.
Antiv-virus programs use lists of filenames and filesizes to search for malicious apps. This means they can only protect you from known malicious software. Since there are no known viruses, and Google removes malicious apps as soon as they are found, and before AV programs can be updated, there is no reason to use AV apps on an Android phone at this time.