We like a lot of your designs. Thank you for the effort.
#2: We like this design, except we can't emphasize "do". #9 with the tile emblem on left doesn't seem to work. Perhaps you could experiment with the tile emblem on the right but without accentuating the "do".
#5: We like this design, though it reminds us of Skype's. Perhaps other colors?
General: Is there any way to write the tapendo using tiles? Crazy idea perhaps. Also, you can experiment with other colors besides blue; no need to take the contest brief on 'blue' so literally.