Siddur Sim Shalom - or Hadash

Or Hadash

Or Hadash: A Commentary on Siddur Sim Shalom for Shabbat and Festivals was written by Israel Masorti Rabbi Reuven Hammer, and published in 2003. It contains the complete text of the siddur for the Sabbath and festivals, surrounded by a comprehensive commentary. The page layout loosely resembles that of the Talmud.

Or Hadash: A Commentary on Siddur Sim Shalom for Weekdays was also written by Israel Masorti Rabbi Reuven Hammer, and published in 2008. It contains the complete text of the siddur for weekdays, surrounded by a comprehensive commentary.

Both volumes offer information on the historical development of the liturgy, "a phrase-by-phrase commentary, a linguistic, literary and theological explanation of their structure and meaning as well as interpretations meant to make them relevant for the modern worshipper."