I don't use the 'ask' section link, but regularly click on them from the 'new' or main view.

What categories would you suggest? Business, technology, environment, programming, apple, facebook? Ok, probably not apple and facebook though those do get an inordinate amount of links.

Personally I wouldn't use them, and my concern would be that people who come only to read articles tagged in that column wouldn't cross-polinate their expertise into cross-over areas.

Just a thought.