hmm, i haden't seen this before.  Interesting idea, but i am not sure I would spend my time doing it.  Perhaps this idea would be better with a little tweaking.  I allready spend a lot of time tyring to keyword my images well so they sell well.  To get paid 2 cents to keyword someone elses image to be better competition against mine isn't a whole lot of compensation.  I am quite content if other people have crappy keywords.

yes, well i do agree it is a nice gesture.. i don't think, however i feel that nice to help others sales go up and mine down.

I think it is a really interesting (and nice) concept in micro stock photography how helpful people are to others, and this is a pretty good example, that there are probably people out there keywording other people images as we speak.  In the old days of macro stock photography (not that i'm speaking from experience mind you) there seemed to be a little more cut throat competition and hidin trade secrets.