If you’re tired of hearing about Lean Startups I recommend giving Fred’s post a quick read. It addresses most of the criticisms you may have heard. My only negative observation is that “being lean” is an old idea that Eric Ries has done a great job of explaining anew. When I led search on the Yahoo home page we were completely data driven. I worked with a team of great designers and engineers, and we came up with many cool (and many lame) ideas for how to improve the visibility and usefulness of search.