/offtopic
jeez dude chill i just gave my opinion, he said nothing about going on a bussines card i was expecting something like a website logo, without info i can only go for what i think it appears to be :P
/ontopic
as marci provided, martin reinhard said that the letters are to close together, if you just space them a bit it think the logo is done and finnished, lets hope he choses your design