Improve the gallery page (http://docs.codehaus.org/display/GEOS/Gallery), organizing it into topical sections (wms, wfs, google, svg, and so on).
Create a little excerpt, and give a more prominent view of the gallery on the geoserver home page.
Blog about the gallery, and ask users to provide more samples (this will eventually push the page to
the limits, we'll reorganize it in sub-pages if this is needed).