Only if the service is fricken amazing. It's not really the done thing around here. Then again it's rare to get that level of awesome here too. I wonder if the service would be better if they realised they'd get more tips? lol
Yes I tip and depends on the level of service too. If bad then no, If coffee or tea then no, but a little to show appreciation gets a smile and they do work hard and have to put up with grumpy clients!
On the many times i've been to the U.S, I noticed the eateries lOVE their tips, but I feel, because the pay is higher is Oz, it's not expected as much. having just said that, I did leave a 20 cent tip in a little cafe we were in yesterday! (Hey big spender, me!)