Cell phones on the table? Yay or nay?

Recently I came across a short article in ad week talking about business etiquette. I found this pictures funny but this is actually a question I constantly ask myself: should I keep my cell phone/blackberry on the table during business lunch or leave it in my bag. I think my gut reaction is leave it where it can't be seen BUT sometimes I need a time check and I rarely wear a wristwatch so I think it's less rude to have it out then to constantly go into my bag to check it.