Minify your HTML by removing all the unnecessary characters.
Minify your JS by removing all the unnecessary characters.
Get the gravatar.com globally recognized avatar for any email.
Make sure your passwords are good enough.
Take an IP and try to look for the domain/host associated with it.
Get approximate IP details.
Get & verify the meta tags of any website.
Get details of any file type, such as the mime type or last edit date.