The Holy Grail is a multi-column web page layout. It is commonly desired and implemented, although the ways in which it can be implemented with current technologies all have drawbacks. Because of this, finding an optimal implementation has been likened to searching for the elusive Holy Grail.
Three columns. One fixed-width sidebar for your navigation, another for, say, your Google Ads or your Flickr photos and, as in a fancy truffle, a liquid center for the real substance. Its wide applicability in this golden age of blogging, along with its considerable difficulty, is what has earned the layout the title of Holy Grail.