I just flipped through my copy and the majority of the patterns call for sizes 1, 2 or 3 depending on gauge.
There is one pattern for felted booties that calls for 10.5 or 11s and one pattern that calls for sizes 3 or 4.
Jan is right -- the book teaches how to adjust any sock pattern to be knit on 2 circulars. I'm not really that excited about the patterns included in the book so I just used the part on how to adapt a pattern and am making the Embossed Leaves socks from another book using the 2 circs method outlined in the Socks Soar book.
To me that made the book worth having.