I use www.site.com on all printed material, advertising, etc. It seems to be more recognisable for casual web users. Redirect (301) site.com to www.site.com.

I use www.site.com on all printed material, advertising, etc. It seems to be more recognisable for casual web users. Redirect (301) site.com to www.site.com. I think there is a RFC recommending this.