I agree. I think that when amazon starts taking btc it will be a pivotal moment. Right now I know of dell, microsoft, newegg, and purse.io (for amazon). There might be others but those are the ones that I know of.
Be patient, I am sure it will happen!
This is key in the potential worldwide success of bitcoin. Amazon is the biggest online market place in the world bar none. You could literally stick another 0 on the current price within a week or two of Amazon integrating bitcoin into their payment systems I reckon.
Acceptance by Amazon would/will be HUGE.