Marc Canter posted an excerpt from A Personal Information and Knowledge Infrastructure Integrator. This academic paper is chock full of interesting (but familiar) ideas. PIKII is an information management system which, essentially, is the social software/ blogging / semweb scene of the near-future.

Weblogging adapts hypertext features

Nodes:
Encapsulated units of content in any MIME type format identifiable by W3C-compliant protocols and data structures.

Transclusion:
XML RSS-based syndication distributes content across multiple venues.

Link types:
Static and dynamic URIs for tracking and addressing comments, posts and news with time/date stamps and associative properties identifiable using information retrieval methods.

Backlinks:
Trackback and HTTP-referrer linking provides bidirectional links.

Annotation:
A core attribute of many blog posts and the syndication format is a link, often directly connectable to a content-level XML node. Source.