GreyBox, is a very nice utility written in Javascript, which loads URL in a window on Web using AJAX to the purest style like lightbox uses to load images.

DEMO links

Launch Google
My About Page

Want to see how this little simple thing can improve a web application? Click on the picture below to watch a demo of Skeletonz CMS with a GreyBox. The video shows an Ajax based upload of files using GreyBox! GoogieSpell integration is also shown. The video is about 3MB.