At least once a week I explain the necessity of discrete addressability to very bright people. Everyone wants their site linked to, but they generally don't make it easy. Sure, you can always link to a domain, but that doesn't open up the opportunity to develop an intellectual connection between what people are thinking and what your site has. This is one reason blogs have become so widely used - each post is a discrete (unique) information object. It affords the community the opportunity to create relationships that are direct and easily traversed.

"Oh, and there's no permalinks so even if I wanted to link you directly to a piece of content there I couldn't." -- Robert Scoble

Linking to a page (that contains more than one information component) is not longer acceptable. It lacks context and requires users to continue to hunt after clicking. Blogs have changed that, but this is not really about blogs - blogs simply embraced the concept first. Like RSS, blogs popularized the idea that each thought have an address unique to all other thoughts.