Building Link Taxonomies

Say, does Radio offer any link management features? I realize that the blog model says that only the latest or most-linked-to sites are of interest, but it seems that categorizing these links (beyond simply the category/channels built into Radio) might be worthwhile. For one thing, I could tell if I had already cited a link (such as the bare bones Blogs of Note started by the author of the article I just mentioned).
I know I can build a hierarchy of stories or raw pages, but isn’t the point here automating the tedium out of web publishing? (Or one of the points, at least?) I know I can build a link farm using PHP-Nuke, but that’s a whole ‘nother can of worms.