I know that subcategories can also be implemented by the "multiple categories" thing, but maybe a (shallow) hierarchy wouldn't be bad either.

Especially, I'm thinking about having a subcategory under Web Stuff for grabber utilities that snarf information from websites, since there are relatively many such scripts there from what I've glanced...

If there are no subcategories, then simply attaching a Snarf category to these scripts would accomplish the same thing I guess.

On another thing - I think a (short) description what qualifies the programs in the current section wouldn't be bad either. This could help people understand that HTML Utilities does not contain any HTTP transfer related programs etc. - I don't know if this is a problem with people searching in the wrong places, but in this way, even a one-time visiting Anonymous Monk could maybe realize that he/she is searching in the wrong place ...