Amazon have recently announced some changes, as follows: Basically, apart from the name change, the important thing if you are programming AWS applications is that after August 15th you will have to authenticate your calls differently - I read the docs briefly and it seems you need to generate some sort of public key from your private key - it won't just be a case of using your API key. Guess it wasn't secure enough like that. Doesn't sound too complicated, so if I figure it out (which I MUST, else some of my stuff will stop working!) then I will try to describe it here simply.
all these things may not work when it comes to 15th august 2009. You need your secret access key. As all queries to amazon need authentication.
Yes, please see my comment above - hopefully I can explain this too, once I get round to figuring it out myself!
Just to complete this, as mentioned above, the procedure now for accessing AWS (now called the Product Advertising API) is a little more complicated. Basically, along with the request described above you need to attach a hashed key which is created from your original Access Key ID and a new Secret Access Key you get in your AWS back end. To save us all a lot of hassle, some people have kindly put together code to achieve this easily. I found this snippet very useful - it works with PHP4 too. I had this one up and running within minutes. Also, a DP user kindly came up with some code too, which probably only works with PHP5 (uses built-in hashing function) but is even shorter. Now all we have to do is... sell stuff...!