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In the blue box at upper right, post not only a link to the appropriate site section but a thumbnail of it
Added on May 8 2:16
Also put all these thumbnails in one place on the Suggestions front page and in the column at left (maybe expandable with a plus icon). I'd put it in each Suggestion as well for the Recent, Top Voted, Mine, and Completed lists. Users will otherwise find it tedious being sure they put their Suggestions in the right Site Section.