It's about grouping topics from a blog into groups and subgroups.
Surely, many faced with the problem of unsortedness, when viewing a blog from the very beginning in search of certain material - this takes some time and at the same time using search does not always help.
Warning - the meaning is different from the meaning of
this topic .
I suggest creating groups within the blog. For example, in the framework of the blog "I migrate" - it is possible to divide the topics into groups by countries: USA, New Zealand, Cuba, Thailand, Russia, etc; within the “Cascading Style Sheets” blog - into groups: CSS3, fix IE6, practical layout techniques, fonts, etc.
How it will look live:

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Similarly, subgroups can be used in each group.
The ability to correct the group and subgroups for the topic - provide the author of the topic, moderator and administrator. Accordingly, the author, when creating a topic, can immediately indicate its section and subsection from the list in the form of a normal drop-down menu (select).
The list of groups is displayed only on the first page of the blog. You can also make a cross close the list of groups for all who do not want to see the list of groups.
I attach immediately the
layout of such a solution for everyone to see the code.