Yeah, huge +1 for the Flickr/Weasyl style justified image grid. Truly representative thumbnails are essential for browsing a gallery, and the fixed-width-variable-height grid is by far the nicest way I've seen of handling this.
This could apply to more than just imports. You could group together all submissions by the same artist in a specified time-frame (an hour, 15 minutes, whatever works out well)
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