It would be nice to a nice HTML page allowing the user to query and display
1) some faceting info such as hit counts with links that allowed the user to narrow their search results.
2) highlighted summaries
3) easy way to query the dismax handler as well as the standard request handler
Most likely this would be built into the admin pages (and have access to all the field info).
It would also seem useful to have an "advanced query page"... something like
http://www.nabble.com/forum/AdvSearch.jtp or http://www.google.com/advanced_search?hl=en
that would allow one to easily customize and drop into their site. This might be best as contrib module run outside of Solr (a JSP, etc?)