I came across this site and wanted my own page to be publicly view-able without any logins. How can I do this?
Easy! After creating your Visualforce page:
go to Setup > Develop > Sites,
register your Force.com subdomain name,
create a new Force.com Site
next to 'Site Visualforce Pages' click Edit
add your page to the list of Enabled Visualforce Pages
You need to go to your site, click on the name and click edit on the "Site Visualforce Pages" section, add the page to the site.