Inquisitor is now available for free on the App Store. At first glance, it seems to be Yahoo search done right. I used it for a few searches this weekend and was impressed with the results along with the display and UI. More details to come as I dig into the application, including how it compares to the Google iPhone search application.
[Updated: 3/10/09 - See this excellent review of Inquisitor: http://www.iphonejd.com/iphone_jd/2009/03/review-yahoo-inquisitor.html I agree with the review 100% ... Inquisitor is good, will it replace Google mobile or Vlingo as you "go to" search application? Or will it be used as an adjunct... or ultimately deleted to make space for another application?]