I like the on/off symbol in design 20 and the colors of #21, can you change 21 to have the same treatment of the "O" in #20? You could do the same thing with design #18 - remove the shaded oval in the background.
Very nice, Thank you. #35 looks so classic, it reminds me of another logo, but I am not sure. #37 is interesting, I will see what the other team members think.