Structured Blogging -Rajesh Jain:
'Aggregation' in its current form means bringing a bunch of posts together from different places and showing them in a convenient way - usually either on one page, with three panes or two panes. Structured blogging is about letting the aggregator understand what you are talking about, and present things more intelligently. For example if you blog an event notification - maybe you're talking about a concert next week - it might be shown on a calendar along with everyone else's events.