My antispam blog passed 25+ posts, it was enough introduce the categories. But when I started to categorize the posts, I stuck with it. After inventing four topics, I had no more ideas. I though I'm not alone in such trouble, searched in Internet for advices what to do.
The best I found is "Blog Post Category Trauma: How To Help Bloggers With Useless Categories". Unfortunately, this text explans only that bloggers have to have good categories, but doesn't explain how to achieve this goal.
Finally, I invented an ultimate method. Inventing categories and tags (labels) is no more a problem.
From Kipling, The Elephant's Child:
I keep six honest serving-men
(They taught me all I knew);
Their names are What and Why and When
And How and Where and Who.
I send them over land and sea,
I send them east and west;
But after they have worked for me,
I give them all a rest.
I let them rest from nine till five,
For I am busy then,
As well as breakfast, lunch, and tea,
For they are hungry men.
But different folk have different views;
I know a person small-
She keeps ten million serving-men,
Who get no rest at all!
She sends'em abroad on her own affairs,
From the second she opens her eyes-
One million Hows, two million Wheres,
And seven million Whys!
This verse inspired me to try this method:
* Print all the post titles.
* Near each title, write a one-word comments about content of the post, answering the questions "what, why, when, how, where and who".
* If the same word or its synonym is used for three posts, it's a category.
And yes, this method worked fine. I easily got 11 categories.
What's more important is that the method helps to realize categories which can't be found by usual thinking. For example, I even didn't suspect I have category "usability".