Great example of typography & modal dialogs
I’ve been researching into new designs and features for the Tactile CRM website and came across The Typographic Desktop Reference website:

Straight away the site gets to the point and shows you what the product is all about – I’m seriously considering purchasing the book – but also, it has a great way to show pages within the book when you click on them:

These ‘popups’ are commonly know as ‘modal dialogs’ or ‘lightboxes’ and are a great way to display information and gain user input without cluttering the page and requiring page reloads.