I've had several people contact me with concerns about the changes that are taking place with Amazon's API's at the end of August. According to the notices that I've read, seller's access to the Product Advertising API will be discontinued as of August 31st. Sellers are to migrate to the MWS Products API by then. Some of the Amazon Notices are Here and Here
Unfortunately the MWS Products API is somewhat difficult to use, has unrealistic usage expectations for many applications, and doesn't contain some relevant data points.
For the past couple of months I've been working on a service that uses only the approved Amazon APIs and contains all of the possible approved data points in a single, quick API call. I've finally gotten it finished. I've been using it for a short time myself and am ready to start making it available to others. You can read more about it and browse through the documentation and sample responses here:
Let me know if this looks like something your company would be interested in using or if you'd like more details.