If you're looking for feedback, both from a UI design and utility standpoint, you might consider "inlining" results from selected sites, e.g. Wikipedia, stacked change, etc. Having worked on search for a long time, inlining (onebox etc) is a big reason users choose Google, and that channelers fail to get traction. If you're Serious(tm), dog into the publisher structure formats and format those, create a test suite, etc.

A word of caution: if this takes off, as a business it's vulnerable to Google shifting its algorithms slightly to identify the segment of users+queries who prefer these results and give the same results to those queries.

Hope this helps!