Tagging
Tagging, i.e. on-the-fly user generated keyword categorization looks like it is becoming the standard way to categorize weblog content, replacing things like fixed pre-set categories. In other words items are categorized at the point of posting, at the level of individual posts rather than according to a pre-existing taxonomy.
Linkblogging and bookmarking
In addition it looks like the there is an intersection between bookmarking and weblogging, where