I think "GaoYaoGuo" caught the point here, and my answer was based on assumption that your previous H-1B expired on "My last H1B working day is 6/27/08".  In your situation, which is the same as the one in your example, you may withdraw pending H-4 petition after an H-1b xfer has been received. 
The above mentioned memo may not apply to your situation.
I think "GaoYaoGuo" caught the point here - 回复:"My last H1B work
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                    回复:I think "GaoYaoGuo" caught the point here - 回复:"My last H1B w
                     -jerrygreat- 
                    ♂                    
                        
                    
                                                            
                    
                    
                                        
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                        07/14/2008 postreply
                                                07:45:08