Matt Finch has released the 4th edition of the Swords & Wizardry Core rules. You can download a free copy from RPGNow here. Some of the changes include the still optional Thief Class being moved up and included in the Character Class chapter. Some additional combat rules like parrying. Along with a two page sample setting in the appendixes.
To me the Old School Renaissance is not about playing a particular set of rules in a particular way, the dungeon crawl. It is about going back to the roots of our hobby and seeing what we could do differently. What avenues were not explored because of the commercial and personal interests of the game designers of the time.