I'll let you figure out what it means. [Giz@E3]
Sony spent some time and effort to "try" and come up with a nice professional looking wrist strap that you wouldn't mind TOO much if you forgot to take it off for a little while after the conference.
On the other hand Nintendo flat doesn't care or they wanted to make theirs as cheaply as possible with no concern with how it looks... much like the graphics quality and features of the Wii vs. the graphics quality and features of the PS3.
What I notice most of all was the lack of Microsoft strap. Probably because the Microsoft conference was held on a different day? (I don't remember)... it is more likely that the wearer of the Nintendo and PS3 wrist bands just didn't want a third band on that said: "MicroShaft". I don't blame them.