They should have at least made the name tag fill up the whole screen not to mention hiding Safari's address bar. Oh yeah, how about going into landscape mode automatically like YouTube and video playback. Oh wait, the iPhone's screen shuts off automatically after 1 minute too, but that could be kinda cool as people have to "touch me" first to read my name...lol.
I have to agree that you'll probably never see walking around with a Hello My Name Is tag, and then go the extra mile to wear one on an iPhone hanging from my neck lol. Absolutely not, my own personal opinion though.
I do think the idea of using the iPhone as a sign display is very interesting though. I'm sure we'll see some very creative uses for the iPhone in this regard. Maybe Jay Z can put a pic of a diamond on the iPhone and wear it around his neck to promote the new record label eh?