I'd be interested to hear from any employers, especially hospo types like @nate on their views.
As an employer, I'd love tipping. If I took out the wages component of my overheads and just paid my staff a bare minimum (I'm sure in some states in the US, it's $2.50/hour) I'd happily pocket the extra profit.
Would I want it here? Not really.
If I want good staff, I have to pay them well and create an environment that they want to work in. We have a tipping jar (which I have detested since the beginning) and once a week all the staff split them. It's normally a nominal amount, but they're pretty happy with it.