Wording for a Request

• [Casual]  
  Can you ... ?
  
  [Polite]    
  I am wondering if you could ...

• [Casual]  
  Please send me ...
  
  [Polite]    
  I would appreciate it if you would send me ...

• [Casual]  
  I need this within one hour.
  
  [Polite]    
  Would it be possible to have this within one hour?