Websites using some form of Captcha technology on them.
Lightbox is small javascript library used to overlay images on top of the current page. It's a snap to setup and works on all modern browsers.
Website using the € symbol on their website - meaning it may accept payment in Euros.
The website contains Adobe Flash content embeded without the use of JavaScript.
The http-equiv attribute provides an HTTP header for the information/value of the content attribute. The http-equiv attribute can be used to simulate an HTTP response header.