It can be very different. Some universities have guidlines on that. eg. http://postdocs.stanford.edu/handbook/salary.html.
It depends on your field, the boss, the tradition of the department or university. Normally, postdocs in government or national laboratories get paid higher.                   	                  
                  
                
                  
                   
					 
					
             
                  	Cindy A
                    Posted on: 07-May-10 
                    
                    (Post #1)