Awesome Box is a YUI alternative to Lightbox2. It's similar to Lokesh Dhakar's project Lightbox 2, using the Yahoo! UI Javascript Library instead of Script.aculo.us
The site is about interface and interaction design, structured as a pattern language. It features real-live examples from desktop applications, web sites, web applications, mobile devices, and everything in between.
This site contains a lot of best practices in Interaction Design. There is no 'original' design to be found here, it has all been done before. It is a reference or basic 'toolkit' you can use when designing user experiences.