The silverlight PivotViewer control allows you to build very large collections and embed them on your website. Works really well for collections that provide a visual representation of the data you are navigating and uses the silverlight deep zoom feature so navigating high resolution images is very quick.

To download the control go here

To view some demo's check out these sites using it already.

Netflix Demo

Hitched wedding site in the UK

Also Scott Guthrie provides a more in depth article.