I'm not that much crack on askubuntu - more of an asker than an answerer. Compared to other experiences with S.E. sites, I find it pretty difficult to find useful information. I think that you could use a few new tags for basic functions - "save", "edit", "application" and the like while by themselves not terribly illuminating would be useful in combination with others to help users like me who are peripheral ubuntu users find information. It would certainly cut down the number of duplicated questions I end up asking. (Though thanks for each one you mark - this site has been very useful.)
I can see that this could lead to some very vague tagging so perhaps you might require that these tags don't count towards the minimum number of tags? Just a thought.