i have some requirement where i need a pick list on my VF page , pick  
   list contains all  objects.   based on this pick list value i want to  
   display all fields of appropriate object. for example if i select  
   Account from  pick list then it should show all its fields in the  
   page. please tell me how to do this & send some sample code 

i have some requirement where i need a pick list on my VF page , pick  
   list contains all  objects.   based on this pick list value i want to  
   display all fields of appropriate object. for example if i select  
   Account from  pick list then it should show all its fields in the  
   page. please tell me how to do this & send some sample code