All: like the idea with the 'no-bar A'-characters. Feels high-tech :) #7 only: Best of the batch although I dislike the arrows (don't know why) - are there any other way to give the logo life? #8 only: Don't like the rectangle with the switched tags/A-characters. #9 only: Old school - will have to think about it.
#10 - Think I've seen something like that before (although it's nice). To see a bit more about what we do (and why we need to change logo): www.advanced.se
#18 like but seems a bit off - don't know how to describe it. #19 a bit too complex symbol - otherwise nice with tags combined with looking like an A. For more inspiration, please check out more about what we do at www.advanced.se