Drive traffic to your flickr photographies

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Hi people of mylot and flickr users. I wonder how to drive some traffic to one's photos at flickr.com There is some obvious stuff to do: tag your photos, add a caption and some notes, add them to groups, comment on other photographies. But there are certainly more things to consider: What tags are useful? How often should someone upload a new photo? To how many groups should I add my image? At what time of day should I upload? Give me your thoughts :)