Ability to filter, sort, and/or search for titles with reviews.

We base many selection decisions on reviews and it would be helpful to filter searches/lists to include only titles with reviews. (Alternately, sorting reviewed titles to the top of the list would help.) Being able to add "has reviews" as an advanced search criteria would also be useful.

As an additional benefit, with so many self-published/print-on-demand titles cluttering up search results, being able to sort for reviewed titles would help to limit results to a more "reputable" set.