I think it would be great if you could somehow use the great, form building tools within gravity forms to create forms to search/query posts on your site (ie. to create advanced site search forms). For example, I have a client site with Restaurant reviews---utilizing multiple categories like "regions (New York, Philadelphia, etc.)", "type" (cafe, pizzeria, etc.) and custom fields with values like "$$$$", "$$$", whether they have online reservations, etc.
It would be really cool if Gravity Forms allowed you to build forms with category dropdowns, checkboxes, etc. for the user to search your posts (rather than using GF to just collect data or create new posts). Essentially displaying the posts that match those criteria in the search.php (ie. search results) page. It would really give us site owners more power to create very specific forms for our readers to find our posts.