The Amazon web data service is no longer in Beta, for everyone who uses this service to get Alexa page rank there will be major changes coming December 1st when the beta system will be shutdown and the new service will take over, I am currently busy converting my Alexa data finding services to the new system and I suggest you do to. The new system uses a different ID code & a new security code as well as you needing a timestamp on all requests.
Here for more info
Here for more info
