Linux reseller offers 'internet-safe’ PC

An Australian company is marketing a Linux-based 'internet-safe' PC designed to be invulnerable to viruses and spyware. The OS and software run off of read-only media so it can never be permanently infected. Sounds like a pretty good idea but at 595 AUD (~440 USD) it seems a little pricey for a machine that doesn't need a hard drive or much processor power. Product page here.