[Sigia-l] E-commerce Opt-in Marcom Functions

[Polansky, Adam]

I'm looking for information regarding the use of Opt-in controls used on e-commerce sites.  Typically users making purchases are asked if they want to op-in for marketing material, e-mails, newsletters etc.
Does anyone know if there is data that suggests how to improve take-rate.  
For example: 
 - display as close as possible to the final check-out button 
 - display in proximity to billing info 
 - display in proximity to some other customer info capture 
I have some of my own ideas but I'm looking to validate/invalidate them before I go to a product owner.  Granted this is one of those evil uses of the Internet, but I consider the fact that a product owner is even concerned with my opinion a small victory.
I'll let this simmer for a few days.  Thanks to anyone who can point the way. 
-AP 
Adam Polansky :: Lead Information Architect 
Customer Experience Group :: Travelocity.com 
 682.605.2518 ::  214.868.4157 
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"Let us train our minds to desire what the situation demands" 
                                                                      :: Seneca