I've been carrying my Kindle around in public for two days now, and the only person to ask me about it was a friend who knew I was getting it and wanted to see how I liked it. I got asked much more what I was reading when I had paper books!
I'm sorry you're annoyed that people are asking about your ereader, but, well...that's what happens. Maybe if you put a scary cover on it people would keep away?
