So each Label has to be pre-assigned before it can be used? I saw Labels in the Forms module... I guess I better stick with Categories then. I need to avoid complications and redundancies. I thought labels were like hashtags in Twitter - created on the fly.
Yes, I agree with you about the redundancies, but they can come in addition. For example, I only use them for profiles, to define interests, so a member interested in astronomy can easily find other members with the same interest. I could have done with the categories, but the presentation is different and I think it is better in this case.