I understand there are other antivirus programs for Mac OSX and they do more than just search for viruses these days. They search for malware, they detect phishing web sites, etc. and VirusBarrier for the Mac OSX does more than just scan for viruses.
From the functionality described by Intego, VirusBarrier for iOS does more than scan for viruses.
I searched the app store for other virus scanning utilities.
Here is a couple of other utility/reference apps I found in the app store:
Anti-Virus Detective - Decision tree of how you avoid malware.
Virus Scan of Suspicious Websites - only checks websites with the address you need enter.
Sophos - provides a security threat monitor but not I don't believe it warns you about going to known bad websites.
McAfee Global Threat Intelligence - like Sophos it is only informational, it does not scan, or block/warn you from going to known bad websites.
I did not see any other apps in the app store that actually did a virus scan. I don't think there are other anti-virus applications for the iphone that can actually scan for viruses in the files you may receive.
The point here is that VirusBarrier on the Mac is a real application that scans for viruses, malware, phishing etc. They have ported some of the functions of that program to the iOS. They constantly update their threat definitions file. You can scan attachments emailed to you for viruses as well as other threats. I have actually scanned an attachment but found that it was somewhat cumbersome.
I understand the opinions/fact that because the iOS is sandboxed and cannot be changed, that a virus will not effect iOS. However, you can still spread a virus to others. I would be more concerned about that with when sending email to my clients and customers or editing documents on an iPad.
With that said, the VirusBarrier app does have much more functionality that just scanning for viruses and may find malware, phishing schemes etc. to avoid one from doing something foolish.
I have had the VirusBarrier on the Mac warn me a number of times about going to certain websites.
Although I have not tested it, I suspect the further functionality of VirusBarrier for iOS will do the same.