Google Scholar continues to improve as a legal search engine. Google's search team has added a "search within the search" feature that is the hallmark of advanced search functionality. You can read more about it here on the new Google Scholar Blog or here on the 3 Geeks and the Law Blog. The new feature allows a searcher to focus a search if the initial results are overwhelming. This is similar, then, to using the limit features on KeyCite or Shepard's when you get too many citing references.
An aside: the Google Scholar Blog is a new feature. There are only two posts so far. The posts will probably have more relevance to legal researchers than the disparate posts on the basic Google Blog.