The site provides an easy way to search multiple Google services at once. Type in a search term, and What Do You Love will dig up its popularity in Google Trends, photos in Picasa Web Albums, related YouTube videos, books at Google Books, and more. You can also set up a Google Alert using the same search term or start a discussion in Google Groups on the topic.
Note, you have to include the “www.” prefix before the URL for the site to work. What Do You Love hasn’t been officially announced by Google yet, so there may be changes on the way.