It's a change that I've been meaning to make for a while now, but I've only just got around to doing it. Basically, it is now possible to Buzz or Twitter about pages on the site directly from links at the top of each page.
It's a crude way of allowing people to add comments, though currently there's no way to collate such comments to make it easier for others to see. Something a bit better may be added soon, after I've thought about the options.