Rob,
While I agree with your suggestion; most users of this site are probably not in to computers enough to make a dual booted machine. I work for an Internet Security Company technically helping companies purchase Firewalls, application gateways and Endpoint security. What folks here have to do is follow common sense.
1. Firewall at the internet with URL filtering
2. Anti Virus and Anti Malware software on the desktop
3. Do not open any attachment unless you know who it is from.
4. Do not blindly follow links in emails
5. Make sure your family follows the rules
6. Back up everything!!!
7. If you are using Windows7, create accounts for all users. Administrator is only for installing software or working on the system.
This will keep the honest people honest and eliminate 80% of issues. I use the 80/20 rule but it works out better then that.
Martin
For the record, I am writing this on RedHat linux Fedora box. Fred Bear would have wanted it this way.