This is a question from 2012... and it has already been answered several times, in violation of the sherman anti-trust laws...
There is no standard, usual, normal, regular, typical, average, common, commission. And to state that there is puts you in violation of sherman anti trust rules, and opens you (and your brokerage) to potential lawsuits and scrutiny from the Department of Justice and HUD.
All commissions, by law, are negotiable between the consumer and the agent/agency. Now that doesn't mean that each and every agent will negotiate his/her commission. But it does mean that each can charge what they see fit based on the services they offer, and the costs of providing those services.'
This is hammered into real estate agents as Real Estate 101. And for those of you, who are Realtors or agents, who think I, and Ron and Debra are wrong... please show this thread to your managing broker.