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I think adding images is a good one, as a glossary is load of text, adding pics would make it more presentational.  It could double up as a reciprocal link section if you link to other sites relevant to the terms, as many sites as you like for each term. Sounds an interesting idea, one of my sites sells educational products so I could do the same.  I'd be interested to know more too, could this be punishable by search engines if done incorrectly?