Google’s late September modification brought many site owners up short because it targeted something Google hadn’t yet attacked: exact match domains. Danny Sullivan provides a thoughtful and extensive review of it over at Search Engine Land. He believes this EMD update will become a regular filter, much like Panda, and eventually be updated every month. To understand what the EMD update did, you need to understand that Google has historically given a boost – albeit a very small boost – to websites whose domain names exactly match the query performed by a search. So cheapwidgets.com might sh…