Not too long ago I had certain responsibilities with respect to a bank's online banking system and its 3.5 million users. The bad news was that I had to support

Not too long ago I had certain responsibilities with respect to a bank's online banking system and its 3.5 million users. The bad news was that I had to support WebTV. Really. The good news was that I really wasn't worried about Malware on it :-) Getting serious for a moment, I wonder if "walled gardens" like iPhone and its Mobile Safari will have fewer attack vectors for malware because of the difficulty of downloading a trojan and the lack of public plugin support?